单片机-外文翻译-英文文献-中英版-AT89S51概述.doc
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2023-07-03
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The Description of AT89S51
1 General Description
The AT89S51 is a low-power, high-performance CMOS 8-bit microcontroller
with 4K bytes of In-System Programmable Flash memory. The device is
manufactured using Atmel’s high-density nonvolatile memory technology and is
compatible with the industry-standard 80C51 instruction set and pinout. The on-chip
Flash allows the program memory to be reprogrammed in-system or by a
conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU
with In-System Programmable Flash on a monolithic chip, the Atmel AT89S51 is a
powerful microcontroller which provides a highly-flexible and cost-effective solution
to many embedded control applications.
The AT89S51 provides the following standard features: 4K bytes of Flash, 128
bytes of RAM, 32 I/O lines, Watchdog timer, two data pointers, two 16-bit
timer/counters, a five-vector two-level interrupt architecture, a full duplex serial port,
on-chip oscillator, and clock circuitry. In addition, the AT89S51 is designed with
static logic for operation down to zero frequency and supports two software selectable
power saving modes.
The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial
port, and interrupt system to continue functioning. The Power-down mode saves the
RAM contents but freezes the oscillator, disabling all other chip functions until the
next external interrupt or hardware reset.
2 Ports
Port 0 is an 8-bit open drain bi-directional I/O port. As an output port, each pin
can sink eight TTL inputs. When 1s are written to port 0 pins, the pins can be used as
high-impedance inputs. Port 0 can also be configured to be the multiplexed low-order
address/data bus during accesses to external program and data memory. In this mode,
P0 has internal pull-ups. Port 0 also receives the code bytes during Flash
programming and outputs the code bytes during program verification. External
pull-ups are required during program verification.
Port 1 is an 8-bit bi-directional I/O port with internal pull-ups. The Port 1 output
buffers can sink/source four TTL inputs. When 1s are written to Port 1 pins, they are
pulled high by the internal pull-ups and can be used as inputs. As inputs, Port 1 pins
that are externally being pulled low will source current (I
IL
) because of the internal
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