AT89C51RB2-3CSIM datasheet(2/127 Pages) ATMEL

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AT89C51RB2/RC2

4180C–8051–12/03

The AT89C51RB2/RC2 retains all features of the 80C52 with 256 Bytes of internal

RAM, a 9-source 4-level interrupt controller and three timer/counters.

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.

Table 1. Memory Size

Part Number

Flash (Bytes)

XRAM (Bytes)

TOTAL RAM

(Bytes)

I/O

AT89C51RB2

16K

1024

1280

AT89C51RC2

32K

1024

1280

AT89C51IC2

32K

1024

1280

AT89C51RB2-3CSIM датащи(PDF) 2 Page - ATMEL Corporation