PFS154 datasheet(29/91 Pages) PADAUK

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PFS154

8bit MTP Type IO Controller

Page 29 of 91

PDK-DS-PFS154_CN_V105 –Jun. 9, 2020



System CLK = IHRC/32 = 500KHz



Watchdog timer is disabled, ILRC is enabled, PA5 is in input mode

(6)

.ADJUST_IC SYSCLK=ILRC, IHRC=16MHz, VDD=5V

After boot, CLKMD = 0xE4：



IHRC frequency is calibrated to 16MHz@VDD=5V and IHRC module is disabled



System CLK = ILRC



Watchdog timer is disabled, ILRC is enabled, PA5 is in input mode

(7)

.ADJUST_IC DISABLE

After boot, CLKMD is not changed (Do nothing)：



IHRC is not calibrated



System CLK = ILRC or IHRC/64 (by Boot-up_Time)



Watchdog timer is enabled, ILRC is enabled, PA5 is in input mode

5.4.4 External Crystal Oscillator

If crystal oscillator is used, a crystal or resonator is required between X1 and X2. Fig. 2 shows the hardware

connection under this application; the range of operating frequency of crystal oscillator can be from 32 KHz to

4MHz, depending on the crystal placed on; higher frequency oscillator than 4MHz is NOT supported.

Fig. 2: Connection of crystal oscillator

Besides crystal, external capacitor and options of PFS154 should be fine tuned in eoscr (0x0a) register to have

good sinusoidal waveform. The eoscr.7 is used to enable crystal oscillator module, eoscr.6 and eoscr.5 are

used to set the different driving current to meet the requirement of different frequency of crystal oscillator:

 eoscr.[6:5]=01 : Low driving capability, for lower frequency, ex: 32KHz crystal oscillator

 eoscr.[6:5]=10 : Middle driving capability, for middle frequency, ex: 1MHz crystal oscillator

 eoscr.[6:5]=11 : High driving capability, for higher frequency, ex: 4MHz crystal oscillator

Table 4 shows the recommended values of C1 and C2 for different crystal oscillator; the measured start-up time

under its corresponding conditions is also shown. Since the crystal or resonator had its own characteristic, the

PA7/X1

PA6/X2

The values of C1 and C2 should depend on

the specification of crystal.

Eoscr.7

(Enable crystal oscillator)

Eoscr[6:5]

(Select driving current for oscillator)

System clock = EOSC

PA7/X1

PA6/X2

System clock = EOSC

PA7/X1

PA6/X2

The values of C1 and C2 should depend on

the specification of crystal.

Eoscr.7

(Enable crystal oscillator)

Eoscr[6:5]

(Select driving current for oscillator)

System clock = EOSC

PA7/X1

PA6/X2

System clock = EOSC

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