SS1102C datasheet(64/129 Pages) ETC1

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Power-Saving Modes

PRELIMINARY V1.8

13.2.

Mode Definition and Transition

There are five Clocking Modes, i.e. FastAll, SlowAll, StopAll, FastPeri, and SlowPeri

modes. These are controlled by PSCR[2:0] (Power Saving Register bit 2 to 0).

According to these bits, it is decided for the Fast Oscillator (up to 24MHz at 5V or

12Mhz at 3V), Slow Oscillator (32.768KHz), and CPU operation or Instruction

execution to run or stop.

There are two Pin State Modes, i.e. NorPin (Normal Pin operation mode) and HIZ

(High-Z mode). The bit-4 of PSCR(HIZ) selects a mode between them.

In any mode of Clocking Modes, any Pin State Mode can be selected.

It is conceptually possible to make a new clocking power-saving mode because three

bits of PSCR are assigned to select it. But, the other cases except listed five modes are

never proven. If the user needs a new clocking Power-Saving mode other than listed

five, to test and prove it is user’s responsibility. We also recommend that only the listed

mode transition is used. For other transitions than recommended transitions, user must

carefully test it. When Clocking Power-Saving Mode is changed by Software, the next

two instructions should be NOP (No Operation).

TABLE 31.

Clocking Power-Saving Mode Definition and PSCR

PSCR bit

bit-2

bit-1

bit-0

Bit Name

SSTP

FSTP

ISTP

FastAll mode

SlowAll mode

StopAll mode

FastPeri mode

SlowPeri mode

Another Cases

Not Proven

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