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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT89LP428 데이터시트(PDF) 124 Page - ATMEL Corporation |
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AT89LP428 데이터시트(HTML) 124 Page - ATMEL Corporation |
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124 / 149 page  124 3654A–MICRO–8/09 AT89LP428/828 23.9.3 ISP Start Sequence Execute this sequence to exit CPU execution mode and enter ISP mode when the device has passed Power-on Reset and is already operational. 1. Drive RST low. 2. Drive SS high. 3. Wait t RLZ + tSTL. 4. Start programming session. Figure 23-7. In-System Programming (ISP) Start Sequence 23.9.4 ISP Exit Sequence Execute this sequence to exit ISP mode and resume CPU execution mode. 1. Drive SCK low. 1. Wait at least t SSD and drive SS high. 2. Tristate MOSI. 3. Wait at least t SSZ and bring RST high. 4. Tristate SCK. 5. Wait t RHZ and tristate SS. Figure 23-8. In-System Programming (ISP) Exit Sequence Note: The waveforms on this page are not to scale. tSTL VCC RST SS SCK HIGH Z MOSI HIGH Z MISO XTAL1 tRLZ tZSS tSSE VCC RST SS SCK HIGH Z MOSI HIGH Z MISO XTAL1 tSSZ tSSD tRHZ |
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