Configuration Options - Holtek HT45F23A Manual

Configuration Options

Configuration options refer to certain options within the MCU that are programmed into the OTP
Program Memory devices 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.
No.
Oscillator Options
OSC type selection: ERC or crystal or HIRC or EC (external clock)
1
2 Low speed system oscillator selection-f
3 HIRC frequency selection: 4MHz, 910kHz, 2MHz, 8MHz
4 f
S
5 HXT mode selection: 455kHz or 1M~8MHz
Watchdog Options
6 WDT enable or disable
7 CLR WDT instructions: 1 or 2 instructions
LVR/LVD Options
8 LVR function: enable or disable
9 LVR voltage: 2.1V or 2.55V or 3.15V or 4.2V
RC Filter
10 RC filter for TMR0/1 & INT0/1, enable or disable
SPI
11 SIM enable/disable
12 SPI_WCOL: enable/disable
13 SPI_CSEN: enable/disable, used to enable/disable (1/0) software CSEN function
I C
2
14 I C Debounce Time: no debounce, 1 system clock, 2 system clock
2
RES
15 I/O or RES function
Lock Options
16 Lock All
17 Partial Lock
Rev. 1.40
TinyPower Flash MCU with OPA & Comparators
TM
00. HXT (Filter ON)
01. ERC (Filter ON)
10. HIRC (Filter OFF)
11. EC (Filter OFF)
clock selection: f or f /4
SUB SYS
136
HT45F23A/HT45F24A
Options
: LXT, LIRC
L
March 29, 2019