HT45R22E Holtek Semiconductor, HT45R22E Datasheet - Page 53

• Manufacturer Part Number: HT45R22E
• Description: Remote Type 8-bit OTP MCU
• Manufacturer: Holtek Semiconductor

Configuration Options
Configuration options refer to certain options within the MCU that are programmed into the OTP Program Memory de-
vice during the programming process. During the development process, these options are selected using the HT-IDE
software development tools. As these options are programmed into the device using the hardware programming tools,
once they are selected they can not be changed later by the application software. All options must be defined for proper
system function, the details of which are shown in the table.
Rev. 1.00
SCOMC Register
Bit 7
Bit 6,5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Name
No.
POR
R/W
Bit
1
2
3
4
5
6
7
8
9
Watchdog Timer: enable or disable
Watchdog Timer clock source: LXT, LIRC or f
Note: LXT oscillator must be selected by OSC configuration option if WDT clock source is from LXT.
CLRWDT instructions: 1 or 2 instructions
System oscillator configuration: HXT, HIRC, ERC, HIRC + LXT
LVR function: enable or disable
LVR voltage: 2.10V
RES or PA7 pin function
SST: 1024 or 2 clocks (determine t
Internal RC: 4095kHz
R/W
Reserved bit
1: Unpredictable operation - bit must NOT be set high
0: Correct level - bit must be reset to zero for correct operation
ISEL1, ISEL0: SCOM operating current selection (V
SCOMEN: SCOM module On/Off control
SCOMn can be enable by COMnEN if SCOMEN=1
COM3EN: PB3 or SCOM3 selection
COM2EN: PB2 or SCOM2 selection
COM1EN: PB1 or SCOM1 selection
COM0EN: PB0 or SCOM0 selection
7
0
00: 25 A
01: 50 A
10: 100 A
11: 200 A
0: disable
1: enable
0: GPIO
1: SCOM3
0: GPIO
1: SCOM2
0: GPIO
1: SCOM1
0: GPIO
1: SCOM0
ISEL1
R/W
6
0
ISEL0
R/W
5
0
SST
for HIRC/ERC)
SCOMEN
R/W
53
4
0
SYS
Options
/4
COM3EN
R/W
3
0
DD
=3V)
COM2EN
R/W
2
0
COM1EN
R/W
1
0
HT45R22E
March 17, 2010
COM0EN
www.DataSheet4U.com
R/W
0
0