AT89C51RC2-3CSIM datasheet(2/125 Pages) ATMEL

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AT89C51RB2/RC2

4180B–8051–04/03

In addition, the AT89C51RB2/RC2 has a Programmable Counter Array, an XRAM of

1024 Bytes, a Hardware Watchdog Timer, a Keyboard Interface, an SPI Interface, a

more versatile serial channel that facilitates multiprocessor communication (EUART)

and a speed improvement mechanism (X2 mode).

The Pinout is the standard 40/44 pins of the C52.

The fully static design reduces system power consumption of the AT89C51RB2/RC2 by

allowing it to bring the clock frequency down to any value, even DC, without loss of data.

The AT89C51RB2/RC2 has 2 software-selectable modes of reduced activity and 8-bit

clock prescaler for further reduction in power consumption. In Idle mode, the CPU is fro-

zen while the peripherals and the interrupt system are still operating. In power-down

mode, the RAM is saved and all other functions are inoperative.

The added features of the AT89C51RB2/RC2 make it more powerful for applications

that need pulse width modulation, high speed I/O and counting capabilities such as

alarms, motor control, corded phones, and smart card readers.

Block Diagram

Figure 1. Block Diagram

Notes:

1. Alternate function of Port 1.

2. Alternate function of Port 3.

Table 1. Memory Size

Part Number

Flash (Bytes)

XRAM (Bytes)

TOTAL RAM

(Bytes)

I/O

AT89C51RB2

16K

1024

1280

AT89C51RC2

32K

1024

1280

Timer 0

INT

RAM

256x8

PSEN

ALE/

XTAL2

XTAL1

EUART

CPU

Timer 1

Ctrl

(2)

C51

CORE

(2)(2)

Port 0Port 1 Port 2 Port 3

Parallel I/O Ports & Ext. Bus

XRAM

1Kx8

IB-bus

PCA

PROG

Watch

Dog

(2)

(1)

Timer2

(1)

Flash

32Kx8 or

16Kx8

Key

Board

ROM

2Kx8

Boot

BRG

SPI

(1) (1) (1) (1)

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