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AT90USB646_0607 Datasheet(PDF) 24 Page - ATMEL Corporation |
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AT90USB646_0607 Datasheet(HTML) 24 Page - ATMEL Corporation |
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24 / 435 page  24 7593D–AVR–07/06 AT90USB64/128 • Bits 15..12 – Res: Reserved Bits These bits are reserved bits in the AT90USB64/128 and will always read as zero. • Bits 11..0 – EEAR8..0: EEPROM Address The EEPROM Address Registers – EEARH and EEARL specify the EEPROM address in the 4K bytes EEPROM space. The EEPROM data bytes are addressed linearly between 0 and 4096. The initial value of EEAR is undefined. A proper value must be written before the EEPROM may be accessed. 5.3.3 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 operation, the EEDR contains the data read out from the EEPROM at the address given by EEAR. 5.3.4 The EEPROM Control Register – EECR • Bits 7..6 – Res: Reserved Bits These bits are reserved bits in the AT90USB64/128 and will always read as zero. • Bits 5, 4 – EEPM1 and EEPM0: EEPROM Programming Mode Bits The EEPROM Programming mode bit setting defines which programming action that will be trig- gered when writing EEPE. It is possible to program data in one atomic operation (erase the old value and program the new value) or to split the Erase and Write operations in two different operations. The Programming times for the different modes are shown in Table 5-2. While EEPE is set, any write to EEPMn will be ignored. During reset, the EEPMn bits will be reset to 0b00 unless the EEPROM is busy programming. 7654 3 2 1 0 Read/Write 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 R/W Initial Value 0000 X X X X XXXX X X X X Bit 7654 32 1 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 00 0 0 Bit 7654 32 10 – – 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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