HT46C232 datasheet(27/50 Pages) HOLTEK

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HT46R232/HT46C232

Rev. 1.40

November 23, 2005

Options

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

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 CLR WDT instruction can clear

the WDT.

²Two times² 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 and PB

are bit option; PC, PD and PF are port option.

PFD selection.

If PA3 is set as PFD output, there are two types of selections; One is PFD0 as the PFD output, the other is PFD1 as

the PFD output. PFD0, PFD1 are the timer overflow signals of the Timer/Event Counter 0, Timer/Event Counter 1 re-

spectively.

PWM selection: (7+1) or (6+2) mode

PD0: level output or PWM0 output

PD1: level output or PWM1 output

PD2: level output or PWM2 output

PD3: level output or PWM3 output

WDT time-out period selection.

12/f

S~2

13/f

S,2

13/f

S~2

14/f

S,2

14/f

S~2

15/f

S,2

15/f

S~2

16/f

2C Bus function: enable or disable

LVR selection.

LVR has enable or disable options

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