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AT89LP51 Datasheet(PDF) 88 Page - ATMEL Corporation |
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AT89LP51 Datasheet(HTML) 88 Page - ATMEL Corporation |
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88 / 113 page  88 3709B–MICRO–12/10 AT89LP51/52 - Preliminary Figure 17-9. Serial Programming Power-up Sequence 17.9.2 Power-down Sequence Execute this sequence to power-down the device after programming. 1. Drive SCK low. 2. Wait at least t SSD and Tristate MOSI. 3. Wait at least t RHZ and drive RST low. 4. Wait at least t SSZ and tristate SCK. 5. Wait no more than t PWRDN and power off VDD. Figure 17-10. Serial Programming Power-down Sequence 17.9.3 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 high. 2. Wait t RLZ + tSTL. 3. Drive SCK low. 4. Start programming session. VDD RST RST SCK HIGH Z MISO HIGH Z MOSI tPWRUP tPOR + tSUT VDD RST SCK HIGH Z MISO HIGH Z MOSI tPWRDN tSSD tSSZ tRHZ |
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