HT45R37V Holtek Semiconductor Inc., HT45R37V Datasheet - Page 73

• Manufacturer Part Number: HT45R37V
• Description: C/r-f Type 8-bit Otp Mcu
• Manufacturer: Holtek Semiconductor Inc.

Rev. 1.00
Configuration Options
Configuration options refer to certain options within the MCU that are programmed into the device during the program-
ming 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 cannot be changed later as the application software has no control over the configuration options. All options must
be defined for proper system function, the details of which are shown in the table.
Oscillator Options
Reset Option
PFD Options
Buzzer Options
Time Base Option
Watchdog Options
LVD/LVR Options
SPI Options
I
2
C Option
No.
10
11
12
13
14
15
16
17
18
19
20
21
22
1
2
3
4
5
6
7
8
9
High Frequency Oscillator type selection
1. External Crystal Oscillator
2. External RC Oscillator
3. Internal RC Oscillator
4. Externally supplied clock
f
1. 32768Hz External Oscillator
2. 32K_INT Internal Oscillator
Internal RC Oscillator frequency select:
4MHz, 8MHz or 12MHz
f
XTAL mode selection: 455kHz or 1M~12MHz
Fast wake-up from HALT mode (Only for external crystal oscillator): enable/disable
Rest pin Function: PC0 or Reset Pin
PA3: normal I/O or PFD output
PFD clock selection: Timer/Event Counter 0 or Timer/Event Counter 1
PA0/PA1: normal I/O or BZ/BZ or PA0=BZ and PA1 as normal I/O
Buzzer frequency: f
Time base time-out period: 2
Watchdog Timer function: enable or disable
CLRWDT instructions: 1 or 2 instructions
WDT time-out period: 2
LVD function: enable or disable
LVR function: enable or disable
LVR/LVD voltage: 2.1V/2.2V or 3.15V/3.3V or 4.2V/4.4V
SIM interface enable/disable
SPI_WCOL: enable/disable
SPI_CSEN: enable/disable, used to enable/disable (1/0) software CSEN function
I
SL
S
2
C debounce Time: no debounce, 1 system clock debounce, 2 system clock debounce
clock selection: f
and f
SUB
clock selection (Low frequency oscillator type selection)
SUB
S
/2
or f
2
, f
12
/f
S
SYS
/2
S
~2
3
/4
, f
12
13
/f
S
/f
/2
S
, 2
S
4
, 2
, f
13
S
13
/f
/2
/f
S
5
, 2
S
, f
~2
14
S
/2
14
/f
73
/f
S
6
, f
, 2
S
, 2
Options
S
15
/2
14
/f
7
/f
, f
S
S
S
~2
/2
15
8
, f
/f
S
S
, 2
/2
9
15
/f
S
~2
16
/f
S
October 20, 2009
HT45R37V