AT89LP428 datasheet(9/149 Pages) ATMEL

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3654A–MICRO–8/09

AT89LP428/828

3.1

Program Memory

The AT89LP428/828 contains 4K/8K bytes of on-chip In-System Programmable Flash memory

for program storage. The Flash memory has an endurance of at least 100,000 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 30). Constant

tables can be allocated within the entire 4K/8K program memory address space for access by

the MOVC instruction. The AT89LP428/828 does not support external program memory. A map

of the AT89LP428/828 program memory is shown in Figure 3-1.

Figure 3-1.

Program Memory Map

3.1.1

SIG

In addition to the 4K/8K code space, the AT89LP428/828 also supports a 128-byte User

Signature Array and a 64-byte Atmel Signature Array that are accessible by the CPU. The Atmel

Signature Array is initialized with the Device ID in the factory. The second page of the User Sig-

nature Array (00C0H - 00FFH) is initialized with analog configuration data including the Internal

RC Oscillator calibration byte. The User Signature Array is also available for user identification

codes or constant parameter data. Data stored in the signature array is not secure. Security bits

will disable writes to the array; however, reads by an external device programmer are always

allowed.

Table 3-2.

AT89LP828 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

0000H - 01FFH

FDATA

On-chip nonvolatile Flash data memory

0200H - 05FFH

CODE

On-chip nonvolatile Flash program memory

0000H - 1FFFH

SIG

On-chip nonvolatile Flash signature array

0000H - 00FFH

Program Memory

0000

1FFF

0000

003F

User Signature Array

0080

00FF

Atmel Signature Array

SIGEN = 0

SIGEN = 1

Program Memory

0000

0FFF

0000

003F

User Signature Array

0080

00FF

Atmel Signature Array

AT89LP428

AT89LP828

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