HT46R51/HT46R52

Rev. 1.40

20

July 12, 2005

Options

The following shows kinds of options in the device. ALL the options must be defined to ensure having a proper function-

ing system.

Options

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.

²One time² means that the ²CLR WDT² instruction can clear

the WDT.

²Two times² means only if both of the ²CLR WDT1² and ²CLR WDT2² 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.