ADuC7019/20/21/22/24/25/26/27/28
Rev. B | Page 2 of 92
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 3
General Description......................................................................... 4
Detailed Block Diagram .............................................................. 5
Specifications..................................................................................... 6
Timing Specifications .................................................................. 9
Absolute Maximum Ratings.......................................................... 16
ESD Caution................................................................................ 16
Pin Configurations and Function Descriptions ......................... 17
ADuC7019/ADuC7020/ADuC7021/ADuC7022 .................. 17
ADuC7024/ADuC7025 ............................................................. 20
ADuC7026/ADuC7027 ............................................................. 23
ADuC7028................................................................................... 26
Typical Performance Characteristics ........................................... 28
Terminology .................................................................................... 31
ADC Specifications .................................................................... 31
DAC Specifications..................................................................... 31
Overview of the ARM7TDMI Core............................................. 32
Thumb Mode (T)........................................................................ 32
Long Multiply (M)...................................................................... 32
EmbeddedICE (I) ....................................................................... 32
Exceptions ................................................................................... 32
ARM Registers ............................................................................ 32
Interrupt Latency........................................................................ 33
Memory Organization ................................................................... 34
Memory Access........................................................................... 34
Flash/EE Memory....................................................................... 34
SRAM........................................................................................... 34
Memory Mapped Registers ....................................................... 34
ADC Circuit Overview .................................................................. 38
Transfer Function ....................................................................... 38
Typical Operation....................................................................... 39
MMRs Interface.......................................................................... 39
Converter Operation.................................................................. 41
Driving the Analog Inputs ........................................................ 42
Calibration................................................................................... 43
Temperature Sensor ................................................................... 43
Band Gap Reference................................................................... 43
Nonvolatile Flash/EE Memory ..................................................... 44
Programming.............................................................................. 44
Security ........................................................................................ 45
Flash/EE Control Interface ....................................................... 45
Execution Time from SRAM and Flash/EE............................ 47
Reset and Remap ........................................................................ 47
Other Analog Peripherals.............................................................. 49
DAC.............................................................................................. 49
Power Supply Monitor............................................................... 50
Comparator................................................................................. 50
Oscillator and PLL—Power Control........................................ 51
Digital Peripherals.......................................................................... 54
3-Phase PWM............................................................................. 54
Description of the PWM Block ................................................ 55
General-Purpose Input/Output................................................ 60
Serial Port Mux........................................................................... 62
UART Serial Interface................................................................ 62
Serial Peripheral Interface......................................................... 66
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2
C-Compatible Interfaces......................................................... 68
Programmable Logic Array (PLA)........................................... 72
Processor Reference Peripherals................................................... 75
Interrupt System......................................................................... 75
Timers.......................................................................................... 76
External Memory Interfacing ................................................... 80
Hardware Design Considerations ................................................ 84
Power Supplies............................................................................ 84
Grounding and Board Layout Recommendations................. 85
Clock Oscillator.......................................................................... 85
Power-on Reset Operation........................................................ 86
Typical System Configuration .................................................. 86
Development Tools......................................................................... 87
PC-Based Tools........................................................................... 87
In-Circuit Serial Downloader................................................... 87
Outline Dimensions ....................................................................... 88
Ordering Guide .......................................................................... 90
