HT46R71D Holtek Semiconductor, HT46R71D Datasheet - Page 26

• Manufacturer Part Number: HT46R71D
• Description: A/D with LCD Type 8-Bit MCU
• Manufacturer: Holtek Semiconductor

Options
The following shows the options in the device. All these options should be defined in order to ensure proper functioning
system.
Rev. 1.00
f
There are two types of selections: Int.RCOSC or f
WDT clock source selection.
There are two types of selections: system clock/4 or Int.RCOSC.
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, the WDT can be
cleared.
Buzzer output frequency selection.
There are eight types of frequency signals for buzzer output: f
tions.
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 and PB
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.
LCD common selection.
There are three types of selections: 2 common (1/2 duty) or 3 common (1/3 duty).
LCD bias selection.
This option is to determine what kind of bias is selected, 1/2 bias or 1/3 bias.
LCD driver clock frequency selection.
There are two types of frequency signals for the LCD driver circuits: Int.RCOSC/3~Int.RCOSC/4.
LCD ON/OFF at HALT selection
LVR selection.
LVR has enable or disable options
LVD selection.
LVD has enable or disable options
INT trigger edge selection: disable; high to low; low to high; low to high or high to low
Partial-lock selection: Page0~3, Page4~6, Page7.
S
15
clock source.
/f
S
~2
16
/f
S
,
SYS
Options
/4
26
S
/2
2
~f
12
S
/f
/2
S
~2
9
. f
13
S
/f
S
means the clock source selected by op-
, 2
13
/f
S
~2
14
/f
S
, 2
14
/f
S
~2
HT46R71D
January 9, 2006
15
/f
S
,