PMS164 datasheet(37/74 Pages) PADAUK

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PMS164

12 Touch Keys OTP Controller

Page 37 of 74

PDK-DS-PMS164-EN-V000 – Mar. 25, 2020

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

$ T16M

IHRC, /1, BIT8

// Timer16 setting

…

WORD

count

STT16

count;

stopexe;

…

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

IHRC clocks.

5.9.2. 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. It is recommend to set

GPCC.7=0 to disable the comparator before the command “stopsys”.The following shows the internal status

of PMS164 in detail when “stopsys” command is issued:

 All the oscillator modules are turned off

 OTP memory is turned off

 The contents of SRAM and registers remain unchanged

 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:

CMKMD

0xF4;

Change clock from IHRC to ILRC, disable watchdog timer

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

PMS164 Datasheet(PDF) 37 Page - PADAUK Technology.

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