AT89LP51RB2 datasheet(8/254 Pages) ATMEL

8 / 254 page

3722A–MICRO–10/11

AT89LP51RB2/RC2/IC2 Preliminary

2.1

Block Diagram

Figure 2-1.

Atmel AT89LP51RB2/RC2/IC2 Block Diagram

2.2

System Configuration

The AT89LP51RB2/RC2/IC2 supports several system configuration options. Nonvolatile options

are set through user fuses that must be programmed through the flash programming interface.

Volatile options are controlled by software through individual bits of special function registers

(SFRs). The AT89LP51RB2/RC2/IC2 must be properly configured before correct operation can

occur.

2.2.1

Fuse Options

Table 2-1 lists the fusible options for the AT89LP51RB2/RC2/IC2. These options maintain their

state even when the device is powered off. Some may be changed through the Flash API but

others can only be changed with an external device programmer. For more information, see

Section 24.2 “User Configuration Fuses” on page 188.

Flash Code

24/32 KB

Port 2

Configurable I/O

Port 1

Configurable I/O

UART

SPI

Timer 0

Timer 1

Watchdog

Timer

Crystal or

Resonator

Port 4

Configurable I/O

Port 3

Configurable I/O

Timer 2

Port 0

Configurable I/O

RAM

256 Bytes

XRAM

Interface

8051 Single Cycle CPU

with 12-cycle Compatiblity

POR

BOD

Dual Data

Pointers

Multiply

Accumulate

(16 x 16)

ERAM

1152 Bytes

Keyboard

Interface

PCA

Boot ROM

2KB

On-Chip

Debug

Internal 8 MHz

RC Oscillator

Configurable

Oscillator A

10-bit

ADC/DAC

TWI

Dual Analog

Comparators

Crystal or

Resonator

Configurable

Oscillator B

(AT89LP51IC2)

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