ST7285C datasheet(22/117 Pages) STMICROELECTRONICS

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ST7285C

3.6 POWER SAVING MODES

3.6.1 Slow Mode

The following Power Saving mode may be select-

ed by setting the relevant bits in the Miscellaneous

In Slow Mode, the oscillator frequency can be di-

vided by 4, 8, 16 or 32 rather than by 2. The CPU

and peripherals are clocked at this lower frequen-

cy, and therefore the RDS filter cannot operate

correctly in this mode. SLOW mode is used to re-

duce power consumption, and enables the user to

adapt clock frequency to available supply voltage.

3.6.2 Wait Mode

WAIT mode places the MCU in a low power con-

sumption mode by stopping the CPU. All peripher-

als remain active. During WAIT mode, the I bit (CC

All other registers and memory remain un-

changed. The MCU will remain in WAIT mode until

an Interrupt or Reset occurs, whereupon the Pro-

gram Counter branches to the starting address of

the Interrupt or Reset Service Routine.

Refer to Figure 11 below.

Figure 11. Wait Mode Flow Chart

WAIT

VR02062D

EXTERNAL

INTERRUPT

RESET

RESTART

PROCESSOR CLOCK

FETCH RESET

VECTOR OR

SERVICE INTERRUPT

PERIPHERAL

INTERRUPT

ACTIVE OSCILLATOR

AND PERIPHERALS

CLOCKS ACTIVE

PROCESSOR CLOCK

STOPPED

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