AT89LP51 datasheet(7/113 Pages) ATMEL

7 / 113 page

3709C–MICRO–5/11

AT89LP51/52 - Preliminary

2.1

Block Diagram

Figure 2-1.

AT89LP51/52 Block Diagram

2.2

System Configuration

The AT89LP51/52 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 AT89LP51/52 must be properly configured before correct operation can occur.

2.2.1

Fuse Options

Table 2-1 lists the fusable options for the AT89LP51/52. These options maintain their state even

when the device is powered off, but can only be changed with an external device programmer.

For more information, see Section 17.7 “User Configuration Fuses” on page 86.

4K/8K Bytes

Flash Code

UART

16-bit Timer 0

16-bit Timer 1

Watchdog

Timer

Configurable

Oscillator

Crystal or

Resonator

256 Bytes

Flash Data

16-bit Timer 2

256 Bytes

RAM

XRAM

Interface

8051 Single Cycle CPU

with 12-cycle Compatibility

POR

BOD

Port 0

Configurable I/O

Port 1

Configurable I/O

Port 2

Configurable I/O

Port 3

Configurable I/O

Port 4

Configurable I/O

RC Auxiliary

Oscillator

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