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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT89LP4052-20PI 데이터시트(PDF) 67 Page - ATMEL Corporation |
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AT89LP4052-20PI 데이터시트(HTML) 67 Page - ATMEL Corporation |
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67 / 90 page  67 3547F–MICRO–6/06 AT89LP2052/LP4052 22.4.13 Write User Fuses Function: • Program User Fuses. • Unimplemented bits should always be written with 1s. Usage: 1. Bring CS (P3.2) low. 2. Drive P1 to AAh and pulse XTAL1 high. 3. Drive P1 to E1h 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 22-17. Write User Fuses Sequence 22.4.14 Read User Fuses Function: • Read status of User Fuses Usage: 1. Bring CS (P3.2) low. 2. Drive P1 to 0xAA and pulse XTAL1 high. 3. Drive P1 to 0x61 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 22-18. Read User Fuses Sequence Note: The waveforms on this page are not to scale. AAh E1h 00h 00h 1111FFFF CS XTAL1 P1 RDY/BSY AAh 61h 00h 00h 1111FFFF CS XTAL1 P1 |
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