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AT90PWM3 数据表(PDF) 21 Page - ATMEL Corporation |
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AT90PWM3 数据表(HTML) 21 Page - ATMEL Corporation |
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21 / 361 page  21 4317J–AVR–08/10 AT90PWM2/3/2B/3B • Bits 15..9 – Reserved Bits These bits are reserved bits in the AT90PWM2/2B/3/3B 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 written before the EEPROM may be accessed. 6.3.3 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. 6.3.4 The EEPROM Control Register – EECR • Bits 7..6 – Reserved Bits These bits are reserved bits in the AT90PWM2/2B/3/3B 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 EEWE. 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 6-1. While EEWE 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. EEAR7 EEAR6 EEAR5 EEAR4 EEAR3 EEAR2 EEAR1 EEAR0 EEARL 7 654 3 2 1 0 Read/Write R R R R R R R 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 0 0 X XXX 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 000 0000 0 Bit 765 43 2 1 0 – – EEPM1 EEPM0 EERIE EEMWE EEWE 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 Table 6-1. EEPROM Mode Bits EEPM1 EEPM0 Programming Time Operation 0 0 3.4 ms Erase and Write in one operation (Atomic Operation) 0 1 1.8 ms Erase Only 1 0 1.8 ms Write Only 1 1 – Reserved for future use |
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