AT89LP51 datasheet(11/113 Pages) ATMEL

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3709C–MICRO–5/11

AT89LP51/52 - Preliminary

Memory Organization

The AT89LP51/52 uses a Harvard Architecture with separate address spaces for program and

data memory. The program memory has a regular linear address space with support for 64K

bytes of directly addressable application code. The data memory has 256 bytes of internal RAM

and 128 bytes of Special Function Register I/O space. The AT89LP51/52 supports up to 64K

bytes of external data memory, with portions of the external data memory space implemented on

chip as nonvolatile Flash data memory. External program memory is supported for addresses

above 8K. The memory address spaces of the AT89LP51/52 are listed in Table 3-1.

3.1

Program Memory

The AT89LP51/52 contains 4K/8K bytes of on-chip In-System Programmable Flash memory for

program storage, plus support for up to 60K/56K bytes of external program memory. The Flash

memory has an endurance of at least 10,000 write/erase cycles and a minimum data retention

time of 10 years. The reset and interrupt vectors are located within the first 83 bytes of program

memory (refer to Table 9-1 on page 38). Constant tables can be allocated within the entire 64K

program memory address space for access by the MOVC instruction. A map of the

AT89LP51/52 program memory is shown in Figure 3-1.

Pin Sampling Rate (INT0, INT1, T0, T1, T2, T2EX)

Prescaler Rate

System Clock

Minimum RST input pulse in System Clocks

WDIDLE and DISRTO bit locations

AUXR

WDTCON

Table 2-3.

Compatibility Mode versus Fast Mode Summary

Feature

Compatibility

Fast

Table 3-1.

AT89LP51/52 Memory Address Spaces

Name

Description

Range

DATA

Directly addressable internal RAM

00H–7FH

IDATA

Indirectly addressable internal RAM and stack space

00H–FFH

SFR

Directly addressable I/O register space

80H–FFH

FDATA

On-chip nonvolatile Flash data memory

0000H–00FFH

XDATA

External data memory

0100H–FFFFH

CODE

On-chip nonvolatile Flash program memory

0000H–0FFFH (AT89LP51)

0000H–1FFFH (AT89LP52)

XCODE

External program memory

2000H–FFFFH (AT89LP51)

1000H–FFFFH (AT89LP52)

SIG

On-chip nonvolatile Flash signature array

0000H–01FFH

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