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ATMEGA32 Datasheet(PDF) 17 Page - ATMEL Corporation |
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ATMEGA32 Datasheet(HTML) 17 Page - ATMEL Corporation |
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17 / 317 page  17 ATmega32(L) 2503F–AVR–12/03 The EEPROM Address Register – EEARH and EEARL • Bits 15..10 – Res: Reserved Bits These bits are reserved bits in the ATmega32 and will always read as zero. • Bits 9..0 – EEAR9..0: EEPROM Address The EEPROM Address Registers – EEARH and EEARL – specify the EEPROM address in the 1024 bytes EEPROM space. The EEPROM data bytes are addressed linearly between 0 and 1023. The initial value of EEAR is undefined. A proper value must be written before the EEPROM may be accessed. The EEPROM Data Register – EEDR • 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. The EEPROM Control Register – EECR • Bits 7..4 – Res: Reserved Bits These bits are reserved bits in the ATmega32 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. Bit 15 14131211 10 9 8 – – – – – – EEAR9 EEAR8 EEARH EEAR7 EEAR6 EEAR5 EEAR4 EEAR3 EEAR2 EEAR1 EEAR0 EEARL 765 43 21 0 Read/Write R 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 Initial Value 000 00 00 X XX XXX XX X Bit 765 43 21 0 MSB LSB EEDR Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 000 00 00 0 Bit 765 43 2 1 0 – – – – EERIE EEMWE EEWE EERE EECR Read/Write R R R R R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 X 0 |
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