Holtek HT46R22, Handbook

Page: 85 / 162

Configuration Options
The various microcontroller configuration options selected using the HT-IDE are stored in the op-
tion memory. All bits must be defined for proper system function, the details of which are shown in
the table. After the configuration options have been programmed into the microcontroller by the
user, it is important to note that they cannot be altered later by the application program. For the
mask version devices, these configuration options, once defined, are implemented into the
microcontroller during the manufacturing process and therefore cannot be reconfigured by the user.
No. Option
1 WDT clock source: WDT oscillator or f
SYS
/4 or disable
2 CLRWDT instructions: 1 or 2 instructions
3 PA0~PA7 wake-up: enable or disable (by bit)
4
PA, PB, PC, PD, PF pull-high enable or disable
(Number of ports is device dependent. Pull-high bit or port is also device dependent.)
5 PD0~PD3: PWM function selection. Number of PWM channels are device dependent.
6
PWM mode selection: (7+1) or (6+2) mode
(excluding HT46R47/HT46C47, which is fixed at (6+2) mode)
7 OSC type selection: RC or crystal
8
PA3 PFD function: enable or disable
PFD source selection: from timer 0 or timer 1 PFD output (for HT46R24/HT46C24 only)
9 WDT division ratio: 2
12
, 2
13
, 2
14
or 2
15
(excluding HT46R47/HT46C47)
10 PA6, PA7 I
2
C bus function: enable or disable (excluding HT46R47/HT46C47)
11 LVR function: enable or disable
A/D Type MCU
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