HT46R652

Rev. 1.00

29

December 19, 2006

Configuration Options

The following shows the configuration options in the device. All these options must be defined in order to ensure proper

functioning of the microcontroller.

Options

OSC type selection. This option is to decide if an RC or crystal or 32768Hz crystal oscillator is chosen as the system

clock.

WDT, RTC and time base clock source selection.

There are three types of selections: system clock/4 or RTC OSC or WDT OSC.

WDT enable/disable selection. WDT can be enabled or disabled by option.

WDT time-out period selection. There are four types of selection: WDT clock source divided by 2

2

CLR WDT times selection. This option defines the method 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, the WDT can be cleared.

Time Base time-out period selection. The Time Base time-out period ranges from 2

source selected by options.

means the clock source selected by options.

Wake-up selection. This option defines the wake-up capability. 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 the pull-high resistance is visible or not in the input mode of the

I/O ports. PA, PB, PC and PD can be independently selected (bit option).

I/O pins shared with other function selections.

PA0/BZ, PA1/BZ: PA0 and PA1 can be set as I/O pins or as buzzer outputs.

LCD common selection. There are three types of selections: 2 common (1/2 duty) or 3 common (1/3 duty) or 4 com-

mon (1/4 duty). If the 4 common is selected, the segment output pin

²SEG40² will be setup as a common output.

LCD bias power supply selection.

There are two types of selections: 1/2 bias or 1/3 bias

LCD bias type selection. This option is to determine what kind of bias is selected, R type or C type.

LCD driver clock frequency selection.

lection by options.

LCD ON/OFF at HALT selection.

LCD Segments as logical output selection, (byte, byte, bit, bit, bit, bit, bit, bit, bit, bit option)

[SEG0~SEG7], [SEG8~SEG15], SEG16, SEG17, SEG18, SEG19, SEG20, SEG21, SEG22, or SEG23

LVR selection. LVR enable\disable option

LVD selection. LVD enable\disable option

PFD selection. If PA3 is setup as a 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 and

Timer/Event Counter 1, respectively.

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

PC0~PC7: General Purpose I/Os or PWM outputs (port option

- no individual pin selection)

PD0~PD7: General Purpose I/O or PWM output (bit option

- individual pin selection)

INT0 or INT1 triggering edge selection: disable; high to low; low to high; low to high or high to low.

LCD bias current selection: low/high driving current (for R type only).