PMS150C datasheet(40/67 Pages) PADAUK

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PMS150C

8 bit IO-Type Controller

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PDK-DS-PMS150C-EN-V004 – Jan. 24, 2018

5.10. Power-Save and Power-Down

There are three operational modes defined by hardware: ON mode, Power-Save mode and Power-Down

modes. ON mode is the state of normal operation with all functions ON, Power-Save mode (“stopexe”) is the

state to reduce operating current and CPU keeps ready to continue, Power-Down mode (“stopsys”) is used

to save power deeply. Therefore, Power-Save mode is used in the system which needs low operating power

with wake-up occasionally and Power-Down mode is used in the system which needs power down deeply

with seldom wake-up. Table 3 shows the differences in oscillator modules between Power-Save mode

(“stopexe”) and Power-Down mode (“stopsys”).

Differences in oscillator modules between STOPSYS and STOPEXE

IHRC

ILRC

STOPSYS

Stop

STOPEXE

No Change

Table 3: Differences in oscillator modules between STOPSYS and STOPEXE

5.10.1. Power-Save mode (“stopexe”)

Using “stopexe” instruction to enter the Power-Save mode, only system clock is disabled, remaining all the

oscillator modules be active. For CPU, it stops executing; however, for Timer16, counter keep counting if its

clock source is not the system clock. The wake-up sources for “stopexe” can be IO-toggle or Timer16

counts to set values when the clock source of Timer16 is IHRC or ILRC modules. Wake-up from input pins

can be considered as a continuation of normal execution, the detail information for Power-Save mode

shown below:

 IHRC and ILRC oscillator modules: No change, keep active if it was enabled.

 System clock: Disable, therefore, CPU stops execution.

 OTP memory is turned off.

 Timer16, Timer2: Stop counting if system clock is selected by clock source or the corresponding

oscillator module is disabled; otherwise, it keeps counting.

 Wake-up sources: IO toggle in digital mode (PxDIER bit is 1) or Timer16 or Timer2.

The watchdog timer must be disabled before issuing the “stopexe” command, the example is shown as

below:

CLKMD.En_WatchDog

// disable watchdog timer

stopexe;

….

// power saving

Wdreset;

CLKMD.En_WatchDog

// enable watchdog timer

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