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AT90S8535 Datasheet(PDF) 101 Page - ATMEL Corporation |
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AT90S8535 Datasheet(HTML) 101 Page - ATMEL Corporation |
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101 / 127 page  101 AT90S/LS8535 1041H–11/01 4. If a Chip Erase is performed (must be done to erase the Flash), wait t WD_ERASE after the instruction, give RESET a positive pulse and start over from step 2. See Table 44 for t WD_ERASE value. 5. The Flash or EEPROM array is programmed one byte at a time by supplying the address and data together with the appropriate Write instruction. An EEPROM memory location is first automatically erased before new data is written. Use Data Polling to detect when the next byte in the Flash or EEPROM can be writ- ten. If polling is not used, wait t WD_PROG before transmitting the next instruction. See Table 45 for t WD_PROG value. In an erased device, no $FFs in the data file(s) needs to be programmed. 6. Any memory location can be verified by using the Read instruction that returns the content at the selected address at the serial output MISO (PB6) pin. 7. At the end of the programming session, RESET can be set high to commence normal operation. 8. Power-off sequence (if needed): Set XTAL1 to “0” (if a crystal is not used). Set RESET to “1”. Turn VCC power off. Data Polling EEPROM When a byte is being programmed into the EEPROM, reading the address location being programmed will give the value P1 until the auto-erase is finished and then the value P2. See Table 41 for P1 and P2 values. At the time the device is ready for a new EEPROM byte, the programmed value will read correctly. This is used to determine when the next byte can be written. This will not work for the values P1 and P2, so when programming these values, the user will have to wait for at least the prescribed time tWD_PROG before programming the next byte. See Table 45 for tWD_PROG value. As a chip-erased device contains $FF in all locations, program- ming of addresses that are meant to contain $FF can be skipped. This does not apply if the EEPROM is reprogrammed without first chip-erasing the device. Data Polling Flash When a byte is being programmed into the Flash, reading the address location being programmed will give the value $FF. At the time the device is ready for a new byte, the programmed value will read correctly. This is used to determine when the next byte can be written. This will not work for the value $FF, so when programming this value, the user will have to wait for at least t WD_PROG before programming the next byte. As a chip- erased device contains $FF in all locations, programming of addresses that are meant to contain $FF can be skipped. Figure 72. Serial Programming Waveforms Table 41. Read Back Value during EEPROM Polling Part P1 P2 AT90S/LS8535 $00 $FF MSB MSB LSB LSB SERIAL CLOCK INPUT PB7(SCK) SERIAL DATA INPUT PB5(MOSI) SERIAL DATA OUTPUT PB6(MISO) |
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