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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ATtiny45 데이터시트(PDF) 16 Page - ATMEL Corporation |
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ATtiny45 데이터시트(HTML) 16 Page - ATMEL Corporation |
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16 / 196 page  16 7598H–AVR–07/09 ATtiny25/45/85 5.3.2 EEPROM Address Register High – EEARH • Bit 7..1 – Res6..0: Reserved Bits These bits are reserved for future use and will always read as 0 in ATtiny25/45/85. • Bits 0 – EEAR8: EEPROM Address The EEPROM Address Register – EEARH – specifies the high EEPROM address in the 128/256/512 bytes EEPROM space. The EEPROM data bytes are addressed linearly between 0 and 127/255/511. The initial value of EEAR is undefined. A proper value must be written before the EEPROM may be accessed. 5.3.3 EEPROM Address Register – EEARL • Bits 7..0 – EEAR7..0: EEPROM Address The EEPROM Address Register – EEARL – specifies the low EEPROM address in the 128/256/512 bytes EEPROM space. The EEPROM data bytes are addressed linearly between 0 and 127/255/511. The initial value of EEAR is undefined. A proper value must be written before the EEPROM may be accessed. 5.3.4 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 operation, the EEDR contains the data read out from the EEPROM at the address given by EEAR. 5.3.5 EEPROM Control Register – EECR • Bit 7 – Res: Reserved Bit This bit is reserved for future use and will always read as 0 in ATtiny25/45/85. For compatibility with future AVR devices, always write this bit to zero. After reading, mask out this bit. Bit 765 4321 0 ---- --- EEAR8 EEARH Read/Write RR RRRR R R/W Initial Value X X X X X X X X Bit 765 432 10 EEAR7 EEAR6 EEAR5 EEAR4 EEAR3 EEAR2 EEAR1 EEAR0 EEARL Read/Write R R R/W R/W R/W R/W R/W R/W Initial Value X X X X X X X X Bit 765 4321 0 EEDR7 EEDR6 EEDR5 EEDR4 EEDR3 EEDR2 EEDR1 EEDR0 EEDR Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value X X X X X X X X Bit 7654 3210 – – EEPM1 EEPM0 EERIE EEMPE EEPE EERE EECR Read/Write R R R/W R/W R/W R/W R/W R/W Initial Value 0 0 X X 0 0 X 0 |
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