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AT89LP52-20AU Datasheet(PDF) 11 Page - ATMEL Corporation |
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AT89LP52-20AU Datasheet(HTML) 11 Page - ATMEL Corporation |
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11 / 113 page  11 3709C–MICRO–5/11 AT89LP51/52 - Preliminary 3. 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 12 2 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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