ATtiny87-15XZ datasheet(47/282 Pages) ATMEL

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7728D–AVR–07/09

ATtiny87/ATtiny167

• Bit 0 – SE: Sleep Enable

The SE bit must be written to logic one to make the MCU enter the sleep mode when the

SLEEP instruction is executed. To avoid the MCU entering the sleep mode unless it is the pro-

grammer’s purpose, it is recommended to write the Sleep Enable (SE) bit to one just before

the execution of the SLEEP instruction and to clear it immediately after waking up.

5.9.2

MCUCR – MCU Control Register

• Bit 6 – BODS: BOD Sleep

The BODS bit must be written to logic one in order to turn off BOD during sleep, see Table 5-1

on page 42. Writing to the BODS bit is controlled by a timed sequence and an enable bit,

BODSE in MCUCR. To disable BOD in relevant sleep modes, both BODS and BODSE must

first be set to one. Then, to set the BODS bit, BODS must be set to one and BODSE must be

set to zero within four clock cycles.

The BODS bit is active three clock cycles after it is set. A sleep instruction must be executed

while BODS is active in order to turn off the BOD for the actual sleep mode. The BODS bit is

automatically cleared after three clock cycles.

• Bit 5 – BODSE: BOD Sleep Enable

BODSE enables setting of BODS control bit, as explained in BODS bit description. BOD dis-

able is controlled by a timed sequence.

5.9.3

PRR – Power Reduction Register

• Bit 7 - Res: Reserved bit

This bit is reserved in ATtiny87/167 and will always read as zero.

• Bit 6 - Res: Reserved bit

This bit is reserved in ATtiny87/167 and will always read as zero.

Table 5-2.

Sleep Mode Select

SM1

SM0

Sleep Mode

Idle

ADC Noise Reduction

Power-down

Power-save

Bit

–

BODS

BODSE

PUD

–

MCUCR

Read/Write

R/W

Initial Value

Bit

–

PRLIN

PRSPI

PRTIM1

PRTIM0

PRUSI

PRADC

PRR

Read/Write

R/WR/W

Initial Value

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