HT46RU67 Holtek Semiconductor Inc., HT46RU67 Datasheet - Page 48

• Manufacturer Part Number: HT46RU67
• Description: Ht46ru67/ht46cu67 -- A/d Type 8-bit Mcu With Lcd
• Manufacturer: Holtek Semiconductor Inc.

Options
The following shows the options in the device. All these options should be defined in order to ensure having a proper
functioning system.
Rev. 1.00
OSC type selection.
This option is to determine if an RC or crystal or 32768Hz crystal oscillator is chosen as 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. One time means that the CLR WDT can clear the
WDT. Two times means only if both of the CLR WDT1 and CLR WDT2 have been executed, only then can the
WDT be cleared.
Time Base time-out period selection.
The Time Base time-out period ranges from clock/2
Buzzer output frequency selection.
There are eight types of frequency signals for the buzzer output: clock/2
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 determine whether the pull-high resistance is viable 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 share with other function selections.
PA0/BZ, PA1/BZ: PA0 and PA1 can be set as I/O pins or buzzer outputs.
PA3/PFD: PA3 can be set as I/O pins or PFD output.
LCD common selection.
There are three types of selections: 2 common (1/2 duty) or 3 common (1/3 duty) or 4 common (1/4 duty). If the 4
common is selected, the segment output pin SEG46 will be set 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 (Low or high bias current option).
LCD driver clock frequency selection.
There are seven types of frequency signals for the LCD driver circuits: f
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 has enable or disable options
LVD selection.
LVD has enable or disable options
15
/f
S
~2
16
/f
S
.
12
to clock/2
Options
48
15
. clock means the clock source selected by options.
S
/2
2
12
~ clock/2
2
/f
~f
S
S
~2
/2
13
8
. f
HT46RU67/HT46CU67
/f
9
S
S
. clock means the clock source
, 2
stands for the clock source se-
13
/f
S
~2
14
/f
S
February 27, 2008
, 2
14
/f
S
~2
15
/f
S
or