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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT89LP4052 데이터시트(PDF) 66 Page - ATMEL Corporation |
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AT89LP4052 데이터시트(HTML) 66 Page - ATMEL Corporation |
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66 / 90 page  66 3547F–MICRO–6/06 AT89LP2052/LP4052 22.4.11 Write Lock Bits Function: • Program (lock) Lock Bits 1 and 2. Usage: 1. Bring CS (P3.2) low. 2. Drive P1 to AAh and pulse XTAL1 high. 3. Drive P1 to E4h and pulse XTAL1 high. 4. Drive P1 to 00h and pulse XTAL1 high. 5. Drive P1 to 00h and pulse XTAL1 high. 6. Drive data on P1 and pulse XTAL1 high. 7. Drive CS high. 8. Wait 4 ms, monitor P3.1, or poll data/status. Figure 22-15. Write Lock Bits Sequence 22.4.12 Read Lock Bits Function: • Read status of Lock Bits 1 and 2. Usage: 1. Bring CS (P3.2) low. 2. Drive P1 to 0xAA and pulse XTAL1 high. 3. Drive P1 to 0x64 and pulse XTAL1 high. 4. Drive P1 to 0x00 and pulse XTAL1 high. 5. Drive P1 to 0x00 and bring XTAL1 high. 6. Tri-state P1. 7. Bring XTAL1 low. 8. Read data from P1. 9. Drive CS high. Figure 22-16. Read Lock Bits Sequence Note: The waveforms on this page are not to scale. AAh E4h 00h 00h 111111LL CS XTAL1 P1 RDY/BSY AAh 64h 00h 00h 111111LL CS XTAL1 P1 |
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