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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT89LP4052 데이터시트(PDF) 62 Page - ATMEL Corporation |
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AT89LP4052 데이터시트(HTML) 62 Page - ATMEL Corporation |
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62 / 94 page  62 3547J–MICRO–10/09 AT89LP2052/LP4052 23.4.3 Program Enable Function: • Enables the programming interface to receive commands. • Program Enable must be the first command issued in any programming session. In parallel programming a session is active while RST remains at V PP. In serial programming a session is active while RST remains at V CC. Usage: 1. Bring CS (P3.2) low. 2. Drive P1 to AAh and pulse XTAL1 high. 3. Drive P1 to ACh and pulse XTAL1 high. 4. Drive P1 to 53h and pulse XTAL1 high. 5. Bring CS high. Figure 23-7. Program Enable Sequence 23.4.4 Chip Erase Function: • Erases (programs FFh to) the entire 2/4-Kbyte memory array. • Erases User Signature Row if User Row Programming Fuse bit is enabled. • Lockbit1 and Lockbit2 are programmed to “unlock” state. Usage: 1. Bring CS (P3.2) low. 2. Drive P1 to AAh and pulse XTAL1 high. 3. Drive P1 to 8Ah and pulse XTAL1 high. 4. Bring CS high. 5. Wait 4 ms, monitor P3.1, or poll data/status. Figure 23-8. Chip Erase Sequence Note: The waveforms on this page are not to scale. AAh ACh 53h CS XTAL1 P1 AAh 8Ah CS XTAL1 P1 RDY/BSY |
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