Holtek HT66F20 Manual page 230

• HT66F30/HT66F40/HT66F50/HT66F60
Bit 7
Name D�
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
Bit 3 COM3EN: PC7 or SCOM3 selection
0: GPIO
1: SCOM3
Bit 2 COM2EN: PC6 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. 2.50
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
6 5 4
ISEL� ISEL0 SCOMEN COM3EN
R/W R/W R/W
0 0 0
230
A/D Flash MCU with EEPROM
3 2 1
COM2EN COM�EN
R/W R/W R/W
0 0 0
=5V)
DD
0
COM0EN
R/W
0
��ne 22� 20��