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AT89LP428-20JU Datasheet(PDF) 9 Page - ATMEL Corporation |
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AT89LP428-20JU Datasheet(HTML) 9 Page - ATMEL Corporation |
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9 / 149 page  9 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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