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ATMEGA325 Datasheet(PDF) 20 Page - ATMEL Corporation |
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ATMEGA325 Datasheet(HTML) 20 Page - ATMEL Corporation |
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20 / 353 page  20 ATmega325/3250/645/6450 2570J–AVR–11/06 EEARH and EEARL – The EEPROM Address Register • Bits 15..11 – Res: Reserved Bits These bits are reserved bits in the ATmega325/3250/645/6450 and will always read as zero. • Bits 10..0 – EEAR10..0: EEPROM Address The EEPROM Address Registers – EEARH and EEARL specify the EEPROM address in the 1/2K bytes EEPROM space. The EEPROM data bytes are addressed linearly between 0 and 1023/2047. The initial value of EEAR is undefined. A proper value must be written before the EEPROM may be accessed. Note: EEAR10 is only valid for ATmega645 and ATmega6450. EEDR – The EEPROM Data Register • Bits 7..0 – EEDR7..0: EEPROM Data For the EEPROM write operation, the EEDR Register contains the data to be written to the EEPROM in the address given by the EEAR Register. For the EEPROM read oper- ation, the EEDR contains the data read out from the EEPROM at the address given by EEAR. EECR – The EEPROM Control Register • Bits 7..4 – Res: Reserved Bits These bits are reserved bits in the ATmega325/3250/645/6450 and will always read as zero. • Bit 3 – EERIE: EEPROM Ready Interrupt Enable Writing EERIE to one enables the EEPROM Ready Interrupt if the I bit in SREG is set. Writing EERIE to zero disables the interrupt. The EEPROM Ready interrupt generates a constant interrupt when EEWE is cleared. • Bit 2 – EEMWE: EEPROM Master Write Enable The EEMWE bit determines whether setting EEWE to one causes the EEPROM to be written. When EEMWE is set, setting EEWE within four clock cycles will write data to the EEPROM at the selected address If EEMWE is zero, setting EEWE will have no effect. When EEMWE has been written to one by software, hardware clears the bit to zero after four clock cycles. See the description of the EEWE bit for an EEPROM write procedure. • Bit 1 – EEWE: EEPROM Write Enable Bit 1514 13121110 9 8 0x22 (0x42) – – – – – EEAR10 EEAR9 EEAR8 EEARH 0x21 (0x41) EEAR7 EEAR6 EEAR5 EEAR4 EEAR3 EEAR2 EEAR1 EEAR0 EEARL 76 543 21 0 Read/Write R R R R R R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 X X X X XXX XX XX Bit 7 6 543 21 0 0x20 (0x40) MSB LSB EEDR Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 Bit 76543 210 0x1F (0x3F) –––– EERIE EEMWE EEWE EERE EECR Read/Write R R R R R/W R/W R/W R/W Initial Value 00000 0 X 0 |
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