PFS123 datasheet(43/104 Pages) PADAUK

Part #	PFS123

Description	8bit MTP Type MCU with 12-bit R-Type ADC

PDF	104 Pages

Scroll/Zoom	100%

Manufacturer	PADAUK [PADAUK Technology.]

Direct Link	http://www.padauk.com.tw/

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43 / 104 page

PFS123

8bit MTP MCU with 12-bit R-Type ADC

Page 43 of 104

PDK-DS-PFS123-EN_V000-Aug. 26, 2020

5.6 VDD/2 LCD Bias Voltage Generator

There are five pins, PB0, PB1, PB2, PB5 and PB6, can be selected as the COM ports for LCD applications. By

setting misc.4=1, these five COM ports are able to output VDD, VDD/2, GND three levels voltage.

A COM port can still output VDD & GND by selecting 1 or 0 for pb.x in output mode (pbc.x=1) like a normal IO

port. Additionally, a COM port can also output VDD/2 by switching it to input mode (pbc.x=0). However, keep in

mind to turn off the pull-high resistor pbph.x and pbdier.x to prevent the output voltage level from disturbing.

Fig.9 shows how to use this function.

Pin set to output high

Pin set to input

Pin set to output low

VDD

VDD/2

GND

Fig. 9: Using VDD/2 LCD bias voltage generator

Note: ICE does NOT support the VDD/2 function of PB0.

PFS123 Datasheet(PDF) 43 Page - PADAUK Technology.