PFS172 datasheet(32/92 Pages) PADAUK

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PFS172

8bit MTP MCU with 8-bit ADC

Page 32 of 92

PDK-DS-PFS172-EN_V000-May 8, 2020

resonator, please refer to its specification for proper values of C1 and C2.

Frequency

Measured

Start-up time

Conditions

4MHz

4.7pF

6ms

(eoscr[6:5]=11, misc.6=0)

1MHz

10pF

11ms

(eoscr[6:5]=10, misc.6=0)

32KHz

22pF

450ms

(eoscr[6:5]=01, misc.6=0)

Table 4: Recommend values of C1 and C2 for crystal and resonator oscillators

When using the crystal oscillator, user must pay attention to the stable time of oscillator after enabling it, the

stable time of oscillator will depend on frequency “crystal type” external capacitor and supply voltage. Before

switching the system to the crystal oscillator, user must make sure the oscillator is stable; the reference

program is shown as below:

void

FPPA0 (void)

{

. ADJUST_IC

SYSCLK=IHRC/16, IHRC=16MHz, VDD=5V

EOSCR

Enable, 4MHz;

// EOSCR = 0b110_00000;

T16M EOSC, /1, BIT13;

// T16 receive 2^14=16384 clocks of crystal EOSC,

// Intrq.T16 =>1, crystal EOSC Is stable

WORD

count =

stt16 count;

Intrq.T16

{

nop; }while(!Intrq.T16);

// count from 0x0000 to 0x2000, then set INTRQ.T16

clkmd =

0xB4;

// switch system clock to EOSC;

Clkmd.4 = 0;

// disable IHRC

...

Please notice that the crystal oscillator should be fully turned off before entering the power-down mode, in

order to avoid unexpected wake-up event.

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