HT48CA0-2 Holtek Semiconductor, HT48CA0-2 Datasheet - Page 11

• Manufacturer Part Number: HT48CA0-2
• Description: (HT48RA0-2 / HT48CA0-2) Remote Type 8-Bit MCU
• Manufacturer: Holtek Semiconductor

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Note:
Code Option
The following table shows eight kinds of code option in the HT48RA0-2/HT48CA0-2. All the code options must be de-
fined to ensure proper system functioning.
Rev. 1.50
No.
1
2
3
4
5
6
7
8
9
WDT time-out period selection
Time-out period=
WDT enable/disable selection. This option is to decide whether the WDT timer is enabled or disabled.
CLR WDT times selection. This option defines how to clear the WDT by instruction. One time means that the
CLR WDT instruction can clear the WDT. Two times means only if both of the CLR WDT1 and CLR WDT2 in-
structions have been executed, the WDT can be cleared.
Wake-up selection. This option defines the wake-up activity function. External input pins (PB only) all have the
capability to wake-up the chip from a HALT.
Carrier/level output selection. This option defines the activity of PC0 to be carrier output or level output.
Carry frequency selection.
Carry frequency=
Carrier duty selection. There are two types of selection: 1/2 duty or 1/3 duty.
If carrier frequency=Clock Source/(2, 4, 8 or 16), the duty cycle will be 1/2 duty.
If carrier frequency=Clock Source/3, the duty cycle will be 1/3 duty.
If carrier frequency=Clock Source/(6, 12 or 24), the duty cycle can be 1/2 duty or 1/3 duty.
System oscillator selection. RC or crystal oscillator.
LVR function: enable or disable
*1 To make sure that the system oscillator has stabilized, the SST provides an extra delay of 1024 system
*2 Since low voltage has to be maintained in its original state and exceed 1ms, therefore 1ms delay enters
clock pulses before entering the normal operation.
the reset mode.
Clock Source
Clock Source
(2 or 3) 2
2
n
n
, where n=8~11.
, where n=0~3.
Low Voltage Reset
Code Option
11
HT48RA0-2/HT48CA0-2
July 23, 2004