AT89LP51RB2 datasheet(13/254 Pages) ATMEL

13 / 254 page

3722A–MICRO–10/11

AT89LP51RB2/RC2/IC2 Preliminary

Memory Organization

The AT89LP51RB2/RC2/IC2 uses a Harvard Architecture with separate address spaces for pro-

gram 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 inter-

nal RAM and 128 bytes of Special Function Register I/O space. The AT89LP51RB2/RC2/IC2

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 32K in some configurations. The memory address spaces of the

AT89LP51RB2/RC2/IC2 are listed in Table 3-1.

Note:

1. The size of the EDATA space is configurable with the XRS bits in AUXR.

3.1

Program Memory

The AT89LP51RB2/RC2/IC2 contains 24K/32K bytes of on-chip In-System Programmable Flash

memory for programstorage, plus support for up to 40K/32K 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 59). Constant tables can be allocated within the

entire 64K program memory address space for access by the MOVC instruction. A map of the

AT89LP51RB2/RC2/IC2 program memory is shown in Figure 3-1. See Section 24. “Flash Mem-

ory Programming” on page 185 for more information on programming the flash memory.

Table 3-1.

AT89LP51RB2/RC2/IC2 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

EDATA

On-chip Extra RAM and extended stack space

0000H–03FFH(1)

XDATA

External data memory

0000H–FFFFH

CODE

On-chip nonvolatile Flash program memory (AT89LP51RB2)

0000H–5FFFH

On-chip nonvolatile Flash program memory (AT89LP51xC2)

0000H–7FFFH

XCODE

External program memory (AT89LP51RB2)

6000H–FFFFH

External program memory (AT89LP51xC2)

8000H–FFFFH

SIG

On-chip nonvolatile Flash signature array

0000H–01FFH

BOOT

On-chip Bootloader ROM and Flash API

F800H–FFFFH

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