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AT89LP51ED2 Datasheet(PDF) 11 Page - ATMEL Corporation |
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AT89LP51ED2 Datasheet(HTML) 11 Page - ATMEL Corporation |
11 / 26 page 11 3714AS–MICRO–7/11 AT89LP51RD2/ED2/ID2 Summary - Preliminary 2.3.9 Security The AT89LP51RD2/ED2/ID2 does not support the external access pin (EA). Therefore it is not possible to execute from external program memory in address range 0000H–1FFFH. When the third Lockbit is enabled (Lock Mode 4) external program execution is disabled for all addresses above 1FFFH. This differs from AT89C51RD2/ED2/ID2 where Lock Mode 4 prevents EA from being sampled low, but may still allow external execution at addresses outside the 8K internal space. 2.3.10 Programming The AT89LP51RD2/ED2/ID2 supports a richer command set for In-System Programming (ISP). Exi s ting AT 8 9 C 51 RD2/ED2 pr og r a mme r s s ho u ld b e ab le to pr og r a m t h e AT89LP51RD2/ED2/ID2 in byte mode. In page mode the AT89LP51RD2/ED2/ID2 only supports programming of a half-page of 64 bytes and therefore requires an extra address byte as com- pared to AT89C51RD2/ED2. Furthermore the device signature is located at addresses 0000H, 0001H and 0003H instead of 0000H, 0100H and 0200H. Table 2-3. Compatibility Mode versus Fast Mode Summary Feature Compatibility Fast Instruction Fetch in System Clocks 31 Instruction Execution Time in System Clocks 6, 12, 18 or 24 1, 2, 3, 4 or 5 Default System Clock Divisor 2 1 Default Timer Prescaler Divisor 6 1 Pin Sampling Rate (INT0, INT1, T0, T1, T2, T2EX) Prescaler Rate System Clock Minimum RST input pulse in System Clocks 12 2 |
Similar Part No. - AT89LP51ED2_14 |
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Similar Description - AT89LP51ED2_14 |
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