PFS154 datasheet(86/91 Pages) PADAUK

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PFS154

8bit MTP Type IO Controller

Page 86 of 91

PDK-DS-PFS154_CN_V105 –Jun. 9, 2020

9. Special Notes

This chapter is to remind user who use PFS154 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



For those IO pins of PA that are not used, PADIER[1:2] should be set low in order to prevent them

from leakage.

(3) PA5 is set to be output pin



PA5 can be set to be Open-Drain output pin only, output high requires adding pull-up resistor.

(4) PA5 is set to be PRSTB input pin



Configure PA5 as input



Set CLKMD.0=1 to enable PA5 as PRSTB input pin

(5) PA5 is set to be input pin and to connect with a push button or a switch by a long wire



Needs to put a >10

Ω resistor in between PA5 and the long wire



Avoid using PA5 as input in such application.

(6) 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

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