HT46R52 Holtek Semiconductor, HT46R52 Datasheet - Page 20

• Manufacturer Part Number: HT46R52
• Description: (HT46R51 / HT46R52) A/D Type 8-Bit OTP MCU
• Manufacturer: Holtek Semiconductor

Options
The following shows kinds of options in the device. ALL the options must be defined to ensure having a proper function-
ing system.
Rev. 1.40
OSC type selection.
This option is to decide if an RC or crystal oscillator is chosen as system clock.
WDT source selection.
There are three types of selection: on-chip RC oscillator, instruction clock or disable the WDT.
CLRWDT times selection.
This option defines how to clear the WDT by instruction. One time means that the CLR WDT instruction can clear
the WDT. Two times means only if both of the CLR WDT1 and CLR WDT2 instructions have been executed,
then WDT can be cleared.
Wake-up selection.
This option defines the wake-up function activity. External I/O pins (PA only) all have the capability to wake-up the
chip from a HALT by a falling edge. (Bit option)
Pull-high selection.
This option is to decide whether a pull-high resistance is visible or not in the input mode of the I/O ports. PA, PB and
PD are bit option.
PFD selection.
PA3: Level output or PFD output.
PWM selection.
PD0: level output or PWM output
LVR selection.
Enable or disable LVR function.
Options
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HT46R51/HT46R52
July 12, 2005