HT68F13 datasheet(121/161 Pages) HOLTEK

121 / 161 page

The SCOMEN bit in the SCOMC register is the overall master control for the LCD driver; however

this bit is used in conjunction with the COMnEN bits to select which Port C pins are used for LCD

driving. Note that the Port Control register does not need to first setup the pins as outputs to enable the

LCD driver operation.

SCOMEN

COMnEN

PinFunction

O/P Level

I/O

0or1

I/O

0or1

SCOMn

VDD/2

OutputControl

LCDBiasControl

The LCD COM driver enables a range of selections to be provided to suit the requirement of the LCD

panel which is being used. The bias resistor choice is implemented using the ISEL1 and ISEL0 bits in

the SCOMC register.

SCOMC Register

Bit

Name

ISEL1

ISEL0

SCOMEN

COM3EN

COM2EN

COM1EN

COM0EN

R/W

POR

Bit7

ReservedBit

0:Correctlevel-bitmustberesettozeroforcorrectoperation

1:Unpredictableoperation-bitmustnotbesethigh

Bit6~5

ISEL1,ISEL0:ISEL1~ISEL0:Select SCOM typicalbiascurrent(V

DD=5V)

00:25

01:50

10:100

11:200

Bit4

SCOMEN: SCOM modulecontrol

0:disable

1:enable

Bit3

COM3EN: GPIO orSCOM3selection

0: GPIO

1:SCOM3

Bit2

COM2EN: GPIO orSCOM2selection

0: GPIO

1:SCOM2

Bit1

COM1EN: GPIO orSCOM1selection

0: GPIO

1:SCOM1

Bit0

COM0EN: GPIO orSCOM0selection

0: GPIO

1:SCOM0

Rev.1.10

121

February9,2011

HT68F13/HT68F14/HT68F15

EnhancedI/OFlashTypeMCU

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