HT66F13 datasheet(133/173 Pages) HOLTEK

133 / 173 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

Pin Function

O/P Level

I/O

0or1

I/O

0or1

SCOMn

VDD/2

Output Control

LCD Bias Control

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

76543210

Name

ISEL1

ISEL0

SCOMEN

COM3EN

COM2EN

COM1EN

COM0EN

R/W

POR

00000000

Bit 7

Reserved Bit

0: Correct level - bit must be reset to zero for correct operation

1: Unpredictable operation - bit must not be set high

Bit 6~5

ISEL1, ISEL0: ISEL1 ~ ISEL0: Select SCOM typical bias current (V

DD=5V)

00: 25

01: 50

10: 100

11: 200

Bit 4

SCOMEN: SCOM module control

0: disable

1: enable

Bit 3

COM3EN: GPIO or SCOM3 selection

0: GPIO

1: SCOM3

Bit 2

COM2EN: GPIO or SCOM2 selection

0: GPIO

1: SCOM2

Bit 1

COM1EN: GPIO or SCOM1 selection

0: GPIO

1: SCOM1

Bit 0

COM0EN: GPIO or SCOM0 selection

0: GPIO

1: SCOM0

Rev. 1.10

133

February 9, 2011

HT66F13/HT66F14/HT66F15

Enhanced A/D Flash Type MCU

HT66F13 Datasheet(PDF) 133 Page - Holtek Semiconductor Inc

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