ATtiny261-ESMZ datasheet(24/227 Pages) ATMEL

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7753C–AVR–07/09

ATtiny261/ATtiny461/ATtiny861

• Bit 2 – EEMPE: EEPROM Master Program Enable

The EEMPE bit determines whether writing EEPE to one will have effect or not.

When EEMPE is set, setting EEPE within four clock cycles will program the EEPROM at the

selected address. If EEMPE is zero, setting EEPE will have no effect. When EEMPE has been

written to one by software, hardware clears the bit to zero after four clock cycles.

• Bit 1 – EEPE: EEPROM Program Enable

The EEPROM Program Enable Signal EEPE is the programming enable signal to the EEPROM.

When EEPE is written, the EEPROM will be programmed according to the EEPMn bits setting.

The EEMPE bit must be written to one before a logical one is written to EEPE, otherwise no

EEPROM write takes place. When the write access time has elapsed, the EEPE bit is cleared by

hardware. When EEPE has been set, the CPU is halted for two cycles before the next instruction

is executed.

• Bit 0 – EERE: EEPROM Read Enable

The EEPROM Read Enable Signal – EERE – is the read strobe to the EEPROM. When the cor-

rect address is set up in the EEAR Register, the EERE bit must be written to one to trigger the

EEPROM read. The EEPROM read access takes one instruction, and the requested data is

available immediately. When the EEPROM is read, the CPU is halted for four cycles before the

next instruction is executed. The user should poll the EEPE bit before starting the read opera-

tion. If a write operation is in progress, it is neither possible to read the EEPROM, nor to change

the EEAR Register.

6.5.4

GPIOR2 – General Purpose I/O Register 2

6.5.5

GPIOR1 – General Purpose I/O Register 1

6.5.6

GPIOR0 – General Purpose I/O Register 0

Bit

0x0C (0x2C)

MSB

LSB

GPIOR2

Read/Write

R/W

Initial Value

Bit

0x0B (0x2B)

MSB

LSB

GPIOR1

Read/Write

R/W

Initial Value

Bit

0x0A (0x2A)

MSB

LSB

GPIOR0

Read/Write

R/W

Initial Value

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