Lcd Bias Contro - Holtek HT68F Series Manual

HT68F20/HT68F30/HT68F40/HT68F50/HT68F60
HT68FU30/HT68FU40/HT68FU50/HT68FU60
Enhanced I/O Flash Type 8-Bit MCU with EEPROM
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
• HT68F20
Bit 7
Name D7
R/W R/W
POR 0
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
ISEL1, ISEL0: Select SCOM typical bias current (V
Bit 6~5
00: 25μA
01: 50μA
10: 100μA
11: 200μA
SCOMEN: SCOM module Control
Bit 4
0: Disable
1: Enable
COM3EN: PC3 or SCOM3 selection
Bit 3
0: GPIO
1: SCOM3
Bit 2 COM2EN: PC2 or SCOM2 selection
0: GPIO
1: SCOM2
Bit 1 COM1EN: PC1 or SCOM1 selection
0: GPIO
1: SCOM1
Bit 0 COM0EN: PC0 or SCOM0 selection
0: GPIO
1: SCOM0
Rev. 2.10
6 5 4
ISEL1 ISEL0 SCOMEN COM3EN COM2EN COM1EN COM0EN
R/W R/W R/W
0 0 0
215
3 2 1
R/W R/W R/W
0 0 0
=5V)
DD
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0
R/W
0