AT87F51RC datasheet(2/25 Pages) ATMEL

2 / 25 page

AT87F51RC

user programmed by a conventional nonvolatile memory

programmer. A total of 512 bytes of internal RAM are avail-

able in the AT87F51RC. The 256-byte expanded internal

RAM is accessed via MOVX instructions after clearing bit 1

in the SFR located at address 8EH. The other 256-byte

RAM segment is accessed the same way as the Atmel

AT89-series and other 8052-compatible products. By com-

bining a versatile 8-bit CPU with QuickFlash on a mono-

li t h ic chi p , the A t mel AT 87F 51RC is a power fu l

microcomputer which provides a highly-flexible and cost-

effective solution to many embedded control applications.

Block Diagram

PORT 2 DRIVERS

PORT 2

LATCH

P2.0 - P2.7

QUICK

FLASH

PORT 0

LATCH

RAM

PROGRAM

ADDRESS

BUFFER

INCREMENTER

PROGRAM

COUNTER

DUAL

DPTR

RAM ADDR.

INSTRUCTION

INTERRUPT, SERIAL PORT,

AND TIMER BLOCKS

STACK

POINTER

ACC

TMP2

TMP1

ALU

PSW

TIMING

AND

CONTROL

PORT 3

LATCH

PORT 3 DRIVERS

P3.0 - P3.7

PORT 1

LATCH

PORT 1 DRIVERS

P1.0 - P1.7

OSC

GND

PSEN

ALE/PROG

EA / V

RST

PORT 0 DRIVERS

P0.0 - P0.7

WATCH

DOG

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