T89C51RD2-DDTC-M datasheet, PDF

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T89C51RD2-DDTC-M: Description0 to 40MHz Flash Programmable 8-bit Microcontroller; File Size569KB，86 Pages; ManufacturerAtmel (Microchip)

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T89C51RD2-DDTC-M Overview

0 to 40MHz Flash Programmable 8-bit Microcontroller

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T89C51RD2

0 to 40MHz Flash Programmable 8-bit Microcontroller

1. Description

ATMEL Wireless and Microcontrollers T89C51RD2 is

high performance CMOS Flash version of the 80C51

CMOS single chip 8-bit microcontroller. It contains a

64 Kbytes Flash memory block for program and for data.

The 64 Kbytes Flash memory can be programmed either

in parallel mode or in serial mode with the ISP capability

or with software. The programming voltage is internally

generated from the standard V

pin.

The T89C51RD2 retains all features of the ATMEL

Wireless and Microcontrollers 80C52 with 256 bytes of

internal RAM, a 7-source 4-level interrupt controller and

three timer/counters.

In addition, the T89C51RD2 has a Programmable

Counter Array, an XRAM of 1024 bytes, an EEPROM

of 2048 bytes, a Hardware Watchdog Timer, a more

versatile serial channel that facilitates multiprocessor

communication (EUART) and a speed improvement

mechanism (X2 mode). Pinout is either the standard 40/

44 pins of the C52 or an extended version with 6 ports

in a 64/68 pins package.

The fully static design of the T89C51RD2 allows to

reduce system power consumption by bringing the clock

frequency down to any value, even DC, without loss of

data.

The T89C51RD2 has 2 software-selectable modes of

reduced activity for further reduction in power

consumption. In the idle mode the CPU is frozen while

the peripherals and the interrupt system are still

operating. In the power-down mode the RAM is saved

and all other functions are inoperative.

The added features of the T89C51RD2 makes it more

powerful for applications that need

pulse width

modulation, high speed I/O and counting capabilities

such as alarms, motor control, corded phones, smart card

readers.

2. Features

•

80C52 Compatible

•

8051 pin and instruction compatible

•

Four 8-bit I/O ports (or 6 in 64/68 pins packages)

•

Three 16-bit timer/counters

•

256 bytes scratch pad RAM

•

7 Interrupt sources with 4 priority levels

•

ISP (In System Programming) using standard V

power supply.

•

Dual Data Pointer

•

Variable length MOVX for slow RAM/peripherals

•

Improved X2 mode with independant selection for

CPU and each peripheral

•

2 k bytes EEPROM block for data storage

•

100K Write cycle

•

Programmable Counter Array with:

•

High Speed Output,

•

Compare / Capture,

•

Pulse Width Modulator,

•

Watchdog Timer Capabilities

•

Asynchronous port reset

•

Boot

FLASH contains low level FLASH

programming routines and a default serial loader

•

High-Speed Architecture

•

40 MHz in standard mode

•

20 MHz in X2 mode (6 clocks/machine cycle)

•

64K bytes on-chip Flash program / data Memory

•

Byte and page (128 bytes) erase and write

•

10k write cycles

•

On-chip 1024 bytes expanded RAM (XRAM)

•

Software selectable size (0, 256, 512, 768, 1024

bytes)

•

768 bytes selected at reset for T87C51RD2

compatibility

Rev. F - 15 February, 2001

•

Full duplex Enhanced UART

•

Low EMI (inhibit ALE)

•

Hardware Watchdog Timer (One-time enabled with

Reset-Out)

•

Power control modes:

•

Idle Mode.

•

Power-down mode.

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