C167CS-L datasheet(39/81 Pages) INFINEON

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C167CS-4R

C167CS-L

Data Sheet

V2.2, 2001-08

Power Management

The C167CS provides several means to control the power it consumes either at a given

time or averaged over a certain timespan. Three mechanisms can be used (partly in

parallel):

• Power Saving Modes switch the C167CS into a special operating mode (control via

instructions).

Idle Mode stops the CPU while the peripherals can continue to operate.

Sleep Mode and Power Down Mode stop all clock signals and all operation (RTC may

optionally continue running). Sleep Mode can be terminated by external interrupt

signals.

• Clock Generation Management controls the distribution and the frequency of

internal and external clock signals (control via register SYSCON2).

Slow Down Mode lets the C167CS run at a CPU clock frequency of

fOSC/1 … 32 (half

for prescaler operation) which drastically reduces the consumed power. The PLL can

be optionally disabled while operating in Slow Down Mode.

External circuitry can be controlled via the programmable frequency output FOUT.

• Peripheral Management permits temporary disabling of peripheral modules (control

via register SYSCON3).

Each peripheral can separately be disabled/enabled. A group control option disables

a major part of the peripheral set by setting one single bit.

The on-chip RTC supports intermittent operation of the C167CS by generating cyclic

wakeup signals. This offers full performance to quickly react on action requests while the

intermittent sleep phases greatly reduce the average power consumption of the system.

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