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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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ATmega165 Arkusz danych(PDF) 18 Page - ATMEL Corporation |
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ATmega165 Arkusz danych(HTML) 18 Page - ATMEL Corporation |
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18 / 336 page  18 ATmega165/V 2573G–AVR–07/09 The EEPROM Address Register – EEARH and EEARL • Bits 15..9 – Res: Reserved Bits These bits are reserved bits in the ATmega165 and will always read as zero. • Bits 8..0 – EEAR8..0: EEPROM Address The EEPROM Address Registers – EEARH and EEARL specify the EEPROM address in the 512 bytes EEPROM space. The EEPROM data bytes are addressed linearly between 0 and 511. The initial value of EEAR is undefined. A proper value must be writ- ten 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 ATmega165 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 151413121110 9 8 –––– ––– EEAR8 EEARH EEAR7 EEAR6 EEAR5 EEAR4 EEAR3 EEAR2 EEAR1 EEAR0 EEARL 7654 321 0 Read/Write R RRRR RR R/W R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0000 000 X XX XXX XXX Bit 7654 321 0 MSB LSB EEDR Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0000 000 0 Bit 7654 3 2 1 0 –––– EERIE EEMWE EEWE EERE EECR Read/Write R R R R R/W R/W R/W R/W Initial Value 0000 0 0 X 0 |
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