PFS172 datasheet(87/92 Pages) PADAUK

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PFS172

8bit MTP MCU with 8-bit ADC

Page 87 of 92

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

9. Special Notes

This chapter is to remind user who use PFS172 series IC in order to avoid frequent errors upon operation.

9.1. Warning

User must read all application notes of the IC by detail before using it. Please download the related

application notes from the following link:

http://www.padauk.com.tw/tw/technical/index.aspx

9.2. Using IC

9.2.1. IO pin usage and setting

(1)

IO pin is set to be digital input

 When IO is set as digital input, the level of Vih and Vil would changes with the voltage and temperature.

Please follow the minimum value of Vih and the maximum value of Vil.

 The value of internal pull high resistor would also changes with the voltage, temperature and pin

voltage. It is not the fixed value.

(2)

If IO pin is set to be digital input and enable wake-up function

 Configure IO pin as input.

 Set corresponding bit to “1” in PXDIER.

 If those IO pins of PA that are not used, such as PADIER [1:2], it should be set low in order to prevent

them from leakage.

(3) PA5 is set to be PRST# input pin

 Configure PA5 as input.

 Set CLKMD.0=1 to enable PA5 as PRST# input pin.

(4) PA7 and PA6 as external crystal oscillator

 Configure PA7 and PA6 as input

 Disable PA7 and PA6 internal pull-up resistor

 Configure PADIER register to set PA6 and PA7 as analog input

 EOSCR register bit [6:5] selects corresponding crystal oscillator frequency :



01 : for lower frequency, ex : 32KHz



10 : for middle frequency, ex : 455KHz, 1MHz



11 : for higher frequency, ex : 4MHz

 Program EOSCR.7 =1 to enable crystal oscillator

 Ensure EOSC working well before switching from IHRC or ILRC to EOSC

Note: Please read the PMC-APN013 carefully. According to PMC-APN013, the crystal oscillator should be

used reasonably. If the following situations happen to cause IC start-up slowly or non-startup, PADAUK

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