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ATmega16A Datasheet(PDF) 278 Page - ATMEL Corporation |
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ATmega16A Datasheet(HTML) 278 Page - ATMEL Corporation |
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278 / 352 page  278 8154B–AVR–07/09 ATmega16A 26.8.4 Data Polling EEPROM When a new byte has been written and is being programmed into EEPROM, 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, but the user should have the following in mind: As a chip erased device contains $FF in all locations, programming of addresses that are meant to contain $FF, can be skipped. This does not apply if the EEPROM is re-programmed without chip erasing the device. In this case, data polling cannot be used for the value $FF, and the user will have to wait at least t WD_EEPROM before programming the next byte. See Table 26-12 for t WD_EEPROM value. 26.8.5 Serial Programming Instruction set Table 26-13 on page 278 and Figure 26-8 on page 280 describes the Instruction set. Table 26-12. Minimum Wait Delay before Writing the Next Flash or EEPROM Location Symbol Minimum Wait Delay t WD_FUSE 4.5 ms tWD_FLASH 4.5 ms tWD_EEPROM 9.0 ms t WD_ERASE 9.0 ms Table 26-13. Serial Programming Instruction Set (Hexadecimal values) Instruction(1)/Operation Instruction Format Byte 1 Byte 2 Byte 3 Byte4 Programming Enable $AC $53 $00 $00 Chip Erase (Program Memory/EEPROM) $AC $80 $00 $00 Poll RDY/BSY $F0 $00 $00 data byte out Load Instructions Load Extended Address byte(1) $4D $00 Extended adr $00 Load Program Memory Page, High byte $48 adr MSB adr LSB high data byte in Load Program Memory Page, Low byte $40 adr MSB adr LSB low data byte in Load EEPROM Memory Page (page access)(1) $C1 $00 adr LSB data byte in Read Instructions Read Program Memory, High byte $28 adr MSB adr LSB high data byte out Read Program Memory, Low byte $20 adr MSB adr LSB low data byte out Read EEPROM Memory $A0 adr MSB adr LSB data byte out Read Lock bits $58 $00 $00 data byte out Read Signature Byte $30 $00 0000 000aa data byte out Read Fuse bits $50 $00 $00 data byte out Read Fuse High bits $58 $08 $00 data byte out Read Extended Fuse Bits $50 $08 $00 data byte out |
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