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C8051Fxx系列是Silicon Labs（芯科实验室）推出的一系列高性能混合信号微控制器，以其强大的功能和高性价比在嵌入式系统设计中广泛应用。标题中的"C8051Fxx全系列固件程序写FLASH原程序.rar"暗示了这个压缩包包含了针对C8051F系列单片机的固件程序，特别是涉及到如何将这些程序烧录到单片机的Flash存储器中。 C8051F020是C8051F系列的一员，它是一款集成度极高的8位微控制器，集成了模拟电路和数字电路。其特点包括高速的8051内核，丰富的内置外设，如A/D转换器、D/A转换器、串行通信接口等，以及可编程的Flash存储器。这种单片机的Flash内存允许用户在现场对程序进行修改和更新，无需额外的编程设备。 "an201.pdf"可能是Silicon Labs发布的应用笔记或技术文档，通常这类文档会详细介绍如何使用特定的C8051F系列单片机，包括编程流程、配置选项以及优化技巧。其中可能包含了如何编写和烧录Flash的详细步骤，例如使用哪些编程协议（如JTAG、SPI或I²C），如何设置编程器，以及如何处理编程过程中的错误。 "www.pudn.com.txt"可能是一个文本文件，通常用于提供下载链接或版权信息，对于理解整个压缩包的来源和用途可能有所帮助，但具体内容需要打开文件才能确定。 "AN201SW.zip"很可能包含了一个名为AN201的软件工具或固件示例，这个工具可能是一个固件升级工具或者编程器软件，用于帮助开发者将代码烧录到C8051F020的Flash中。通常，这类软件会提供图形化界面，简化了与单片机的通信和程序上传的过程。这个压缩包资源对于使用C8051F020进行项目开发的工程师非常有价值，它包含了从理论到实践的全套指南，涵盖了从理解单片机特性、编写程序到实际烧录的所有步骤。对于想要学习或深入C8051F系列微控制器的人来说，这是一个不可多得的学习资料。

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C8051Fxx全系列固件程序写FLASH原程序.rar （3个子文件）

an201.pdf 871KB

AN201SW.zip 47KB

www.pudn.com.txt 218B

AN201

WRITING TO FLASH FROM FIRMWARE

Table of Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

2. Key Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

3. Flash Essentials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

3.1. Flash Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

3.2. Device Specific Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

3.2.1. C8051F12x Code Banking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.2.2. C8051F3xx Unlock Bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.2.3. C8051F0xx, C8051F12x, C8051F2xx, and C8051F35x Flash Timing . . . . . . . . . . . . 5

3.3. Flash Read, Write, and Erase Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

4. Basic Flash operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

4.1. Reading A Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

4.2. Writing A Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

4.3. Erasing a Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

5. Advanced Flash Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

6. Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

7. Example Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

7.1. ‘F000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

7.1.1. F000_FlashPrimitives.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

7.1.2. F000_FlashPrimitives.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7.1.3. F000_FlashUtils.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

7.1.4. F000_FlashUtils.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

7.2. ‘F020 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

7.2.1. F020_FlashPrimitives.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7.2.2. F020_FlashPrimitives.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

7.2.3. F020_FlashUtils.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7.2.4. F020_FlashUtils.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7.3. ‘F040 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

7.3.1. F040_FlashPrimitives.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

7.3.2. F040_FlashPrimitives.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

7.3.3. F040_FlashUtils.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

7.3.4. F040_FlashUtils.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Relevant Devices

This application note applies to the following devices:

C8051F000, C8051F001, C8051F002, C8051F005, C8051F006, C8051F007, C8051F010, C8051F011,

C8051F012, C8051F015, C8051F016, C8051F017, C8051F206, C8051F220, C8051F221, C8051F226,

C8051F230, C8051F231, C8051F236, C8051F020, C8051F021, C8051F022, C8051F023, C8051F300,

C8051F301, C8051F302, C8051F303, C8051F304, C8051F305, C8051F310, C8051F311, C8051F320,

C8051F321, C8051F330, C8051F331, C8051F350, C8051F351, C8051F352, and C8051F353.

AN201

2 Rev. 0.1

7.4. ‘F060 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

7.4.1. F060_FlashPrimitives.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

7.4.2. F060_FlashPrimitives.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

7.4.3. F060_FlashUtils.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

7.4.4. F060_FlashUtils.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

7.5. ‘F120 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

7.5.1. F120_FlashPrimitives.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

7.5.2. F120_FlashPrimitives.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

7.5.3. F120_FlashUtils.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

7.5.4. F120_FlashUtils.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

7.6. ‘F200 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

7.6.1. F200_FlashPrimitives.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

7.6.2. F200_FlashPrimitives.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

7.6.3. F200_FlashUtils.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

7.6.4. F200_FlashUtils.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

7.7. ‘F300 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65

7.7.1. F300_FlashPrimitives.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

7.7.2. F300_FlashPrimitives.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

7.7.3. F300_FlashUtils.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

7.7.4. F300_FlashUtils.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

7.8. ‘F310 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73

7.8.1. F310_FlashPrimitives.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

7.8.2. F310_FlashPrimitives.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

7.8.3. F310_FlashUtils.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

7.8.4. F310_FlashUtils.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

7.9. ‘F320 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82

7.9.1. F320_FlashPrimitives.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

7.9.2. F320_FlashPrimitives.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

7.9.3. F320_FlashUtils.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

7.9.4. F330_FlashUtils.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

7.10. ‘F330 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91

7.10.1. F330_FlashPrimitives.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

7.10.2. F330_FlashPrimitives.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

7.10.3. F330_FlashUtils.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

7.10.4. F330_FlashUtils.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

7.11. ‘F350 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100

7.11.1. F350_FlashPrimitives.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

7.11.2. F350_FlashPrimitives.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

7.11.3. F350_FlashUtils.c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

7.11.4. F330_FlashUtils.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .110

AN201

Rev. 0.1 3

1. Introduction

The Flash memory on all Silicon Labs MCU devices is readable and writable from application code. This capability

allows user software to store values to the Flash, such as calibration constants or system parameters, and to

implement a boot loading feature in which user firmware can be updated in-system from a remote site.

The Flash that is not used by application code can be treated like an EEPROM, thus negating the need to connect

an external EEPROM to the device.

This document starts with the basics of accessing Flash from application code on any device, including device

specific details. Then, it discusses advanced routines that can be developed using the basic routines. Finally, it

describes precautions to take when writing to Flash.

Example code for the basic and advanced Flash access routines for all devices is included at the end of this

application note.

2. Key Points

 It is strongly recommended that the V

monitor be enabled during Flash write and erase operations to prevent

data corruption resulting from power irregularities or power-down conditions.

 Disable interrupts before setting PSWE to '1' to prevent interrupt service routines, which may access variables

in xdata space, from generating MOVX writes which could corrupt Flash memory.

 Be cautious when using the 'Large' and 'Compact' memory models, which target xdata and pdata spaces for

user variables, both of which generate MOVX write opcodes.

 In the C8051F3xx series devices, a Lock and Key sequence must be executed before each Flash write or erase

operation.

 In the C8051F3xx series devices, attempts to read, write, or erase code memory locations located in

RESERVED space will generate a device reset.

 Attempts to read, write, or erase code memory locations in RESERVED space will be ignored by the hardware

on non-C8051F3xx devices.

 The CPU is stalled during Flash write and erase operations, although peripherals (UART, ADC, timers, etc.)

remain active.

 Interrupts which are posted during a Flash write or erase operation will be held pending until the completion of

the Flash operation, after which time they will be serviced in priority order.

 The Flash page containing the lock byte or bytes cannot be erased from application code.

AN201

4 Rev. 0.1

3. Flash Essentials

The Flash in different device series has many similarities including page sizes, lock bits, and the instructions used

to read and write to Flash. The main differences are the amount of Flash available, how the V

monitor is

enabled, and how SFR registers are modified to allow Flash writes and erases.

Although the CPU is stalled during Flash write and erase operations, peripherals (UART, ADC, timers, etc.) remain

active. Interrupts posted during a Flash write or erase operation are held until the Flash operation has completed,

after which they are serviced in priority order.

3.1. Flash Organization

The Flash memory on most devices is organized into a set of 512-byte pages. See the Flash chapter of the device

datasheet for specific information. As an example, Figure 1 shows the Flash organization for the C8051F30x

series.

Figure 1. Flash Memory Organization and Security for the C8051F30x Series

Some devices also have a separate scratchpad area of Flash. This scratchpad area is ideal for storing constants

and system parameters because of its smaller size.

Lock Byte Decoding

0x1FFF

0x0200

0x1DFF

Lock Byte

Reserved

Bit Description

if any of these are

'0', Flash is Write/

Erase locked

across the C2

interface

if any of these are

'0', Flash is Read

locked across the

C2 interface

0x1DFE

Flash memory

organized in 512-byte

pages

0x1E00

PROGRAM

MEMORY

0x0000

0x1C00

AN201

Rev. 0.1 5

3.2. Device Specific Notes

Various MCUs have features that require consideration when accessing Flash. These considerations are

described below.

3.2.1. C8051F12x Code Banking

The C8051F12x family of devices have 128KB of Flash which is divided into 4 banks. Addresses in the range

0x00000 to 0x07FFF are mapped to first bank of Flash. Addresses in the range of 0x08000 to 0x0FFFF are

mapped to one of the other three banks based on the settings of the PSBANK register. Whenever accessing Flash

from the address range 0x08000 to 0x07FFF, precaution must be taken to select the correct bank using the

PSBANK register.

3.2.2. C8051F3xx Unlock Bytes

All C8051F3xx devices' writes and erases to Flash are protected with a lock and key function. The Flash Lock and

Key Register (FLKEY) must be written with the correct key codes, in sequence, before Flash operations may be

performed. The key codes are: 0xA5, 0xF1. The timing does not matter, but the codes must be written in order. If

the key codes are written out of order, or the wrong codes are written, Flash writes and erases will be disabled until

the next system reset. Flash writes and erases will also be disabled if a Flash write or erase is attempted before the

key codes have been written properly. The Flash lock resets after each write or erase; the key codes must be

written again before a following Flash operation can be performed.

3.2.3. C8051F0xx, C8051F12x, C8051F2xx, and C8051F35x Flash Timing

Some of the device families require a Flash timing register, FLSCL, to be set to correctly access Flash. The

datasheet for device specific information regarding the FLSCL register.

3.3. Flash Read, Write, and Erase Operations

There are three basic operations that can be performed on the Flash: read, write, and erase. The basic read and

write operations read or write one byte from Flash. The erase operation applies to a full page of Flash.

Flash read operations are accomplished by using the standard 8051 MOVC instruction (in the 'C' language, MOVC

instructions are generated by using pointers of memory type 'code'). Flash write and erase operations on Silicon

Labs MCU devices are accomplished by using the MOVX instruction. The default target for MOVX write operations

is external memory (XRAM); however, devices can be configured such that MOVX write operations target Flash

memory instead. MOVX instructions are generated in 'C' by using pointers of memory type xdata or pdata.

Flash erase operations occur on page boundaries. The erase operation sets all the bits in the Flash page to logic 1.

Flash write operations, which set bits to logic 0, occur on single byte boundaries. To successfully complete a write

to Flash, the target bytes must be erased to 0xFF because the write instruction can only clear bits in a byte.

MOVX write operations on all Silicon Labs MCU devices can target Flash by setting bits in the

PSCTL register. When the PSWE bit (PSCTL.0) is set to a logic 1, MOVX write opcodes target Flash memory

instead of External Memory (XRAM). When both PSWE and PSEE (PSCTL.0 and PSCTL.1) are set to logic 1,

MOVX write opcodes erase the Flash page containing the target address. The target address can be any address

in the target page.

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