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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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AT89LP4052-20PI 数据表(PDF) 64 Page - ATMEL Corporation |
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AT89LP4052-20PI 数据表(HTML) 64 Page - ATMEL Corporation |
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64 / 90 page  64 3547F–MICRO–6/06 AT89LP2052/LP4052 22.4.9 Read User Signature Page Function: • Read 1 to 32 bytes of data from the User Signature Row. • The byte address (offset in page) is initialized to bits [4:0] of the low address byte. The internal address is incremented by one on the negative edge of the XTAL1 pulse. The address will wrap around to the 1st byte of the page when incremented past 31. • Read data will be output on P1 after the falling edge of fourth XTAL1 pulse (address low byte strobe). The programmer should tri-state P1 prior to this edge to avoid bus contention on P1. Usage: 1. Bring CS (P3.2) low. 2. Drive P1 to AAh and pulse XTAL1 high. 3. Drive P1 to 32h and pulse XTAL1 high. 4. Drive P1 to 00h and pulse XTAL1 high. 5. Drive P1 with bits [4:0] of address and bring XTAL1 high. 6. Tri-state P1. 7. Bring XTAL1 low. 8. Read data from P1. 9. To read additional data bytes in the page, pulse XTAL1 high to increment to the next address. 10. Drive CS high. Figure 22-13. Read User Signature Page Sequence Note: The waveform on this page is not to scale. AAh 32h 00h 000bbbbb DOUT 0 CS XTAL1 P1 DOUT 1 DOUTn |
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