Rainbow-electronics ATmega32L Bedienungsanleitung PDF herunterladen (Seite 17)

ATmega32(L)

2503C–AVR–10/02

The EEPROM Address

• 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

• 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 151413121110 9 8

––––––EEAR9EEAR8EEARH

EEAR7 EEAR6 EEAR5 EEAR4 EEAR3 EEAR2 EEAR1 EEAR0 EEARL

76543210

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 0 0 0 0 0 0 0 X

XXXXXXXX

Bit 76543210

MSB LSB EEDR

Read/Write 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 0

Bit 76543210

– – – – 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

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 312 313

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