PFS123 datasheet(60/104 Pages) PADAUK

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PFS123

8bit MTP MCU with 12-bit R-Type ADC

Page 60 of 104

PDK-DS-PFS123-EN_V000-Aug. 26, 2020

An example shows how to use Timer16 to wake-up from “stopexe”:

$ T16M

ILRC, /1, BIT8

// Timer16 setting

$ INTEGS

BIT_R, xxx;

// BITx 0 to 1 will trigger (default)

…

WORD

count =

STT16

count;

stopexe;

…

The initial counting value of Timer16 is zero and the system will be woken up after the Timer16 counts 256

ILRC clocks.

5.12.2 Power-Down mode (“stopsys”)

Power-Down mode is the state of deeply power-saving with turning off all the oscillator modules. By using

the “stopsys” instruction, this chip will be put on Power-Down mode directly. The following shows the

internal status of PFS123 detail when “stopsys” command is issued:

(1) All the oscillator modules are turned off.

(2) MTP memory is turned off.

(3) The contents of SRAM and registers remain unchanged.

(4) Wake-up sources: IO toggle in digital mode. (PxDIER bit is 1)

Wake-up from input pins can be considered as a continuation of normal execution. To minimize power

consumption, all the I/O pins should be carefully manipulated before entering power-down mode. The

reference sample program for power down is shown as below:

CLKMD

0xF4;

Change clock from IHRC to ILRC

CLKMD.4

disable IHRC

…

while (1)

{

STOPSYS;

enter power-down

(…)

break;

if wakeup happen and check OK, then return to high speed,

else stay in power-down mode again.

}

CLKMD =

0x34;

Change clock from ILRC to IHRC/2

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