Rainbow-electronics ATmega8HVD Manuel d'utilisateur télécharger pdf (Page 37)

8052B–AVR–09/08

ATmega4HVD/8HVD

• 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.

9.8.2 PRR0 – Power Reduction Register 0

• Bit 7:6 - Res: Reserved bits

These bits are reserved for future use. For compatibility with future devices, these bits must be

written to zero when PRR0 is written.

• Bit 5 - PRVRM: Power Reduction Voltage Regulator Monitor

Writing a logic one to this bit shuts down the Voltage Regulator Monitor interface by stopping

the clock of the module.

• Bit 4 - Res: Reserved bits

This bit is reserved for future use. For compatibility with future devices, this bit must be written

to zero when PRR0 is written.

• Bit 3 - PRSPI: Power Reduction Serial Peripheral Interface

Writing a logic one to this bit shuts down the Serial Periperal Interface by stopping the clock to

the module.

• Bit 2 - PRTIM1: Power Reduction Timer/Counter1

Writing a logic one to this bit shuts down the Timer/Counter1 module. When the

Timer/Counter1 is enabled, operation will continue like before the shutdown.

• Bit 1 - PRTIM0: Power Reduction Timer/Counter0

Writing a logic one to this bit shuts down the Timer/Counter0 module. When the

Timer/Counter0 is enabled, operation will continue like before the shutdown.

• Bit 0 - PRADC: Power Reduction ADC

Writing a logic one to this bit shuts down the ADC. Before writing the PRADC bit, make sure

that the ADEN bit is cleared to minimize the power consumption.

Note: ADC control registers can be updated even if the PRADC bit is set.

101Reserved

110Reserved

111Reserved

Table 9-3. Sleep Mode Select (Continued)

SM2 SM1 SM0 Sleep Mode

Bit 7 6 5 4 3 2 1 0

- - PRVRM - PRSPI PRTIM1 PRTIM0 PRADC PRR0

Read/Write R R R/W R R R/W R/W R/W

Initial Value 0 0 0 0 0 0 0 0

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 167 168

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Rainbow-electronics ATmega8HVD Manuel d'utilisateur Page 37