HT48RA0A 데이터 시트보기 (PDF) - Holtek Semiconductor
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HT48RA0A Datasheet PDF : 31 Pages
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HT48RA0A
R e a d D a ta
D a ta b u s
S y s te m W a k e -u p
C o d e O p tio n
PB input lines
V DD
P u ll- u p
P B 2~P B 7
D a ta b u s
W r ite
C h ip R e s e t
R e a d D a ta
S y s te m W a k e -u p
D
Q
CK Q
S
V DD
W eak
P u ll- u p
C o d e O p tio n
P B 0 ~ P B 1 o n ly
PA, PB Input/output lines
P A 0~P A 7
P B 0~P B 1
Code Option
The following table shows eight kinds of code option in the HT48RA0A. All the code options must be defined to ensure
proper system functioning.
No.
Code Option
WDT time-out period selection
1
Clock Source
Time-out period=
2n
where n=8~11.
2 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. ²One time² means that the
3 CLR WDT instruction can clear the WDT. ²Two times² means only if both of the CLR WDT1 and CLR WDT2 in-
structions have been executed, the WDT can be cleared.
4
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.
5 Carrier/level output selection. This option defines the activity of PC0 to be carrier output or level output.
Carry frequency selection.
6
Clock Source
Carry frequency= (2 or 3)´2n where n=0~3.
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.
7
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.
8
OSC type selection. This option is to decide if an RC or Crystal oscillator is chosen as system clock. If the Crys-
tal oscillator is selected, the XST (Crystal Start-up Timer) default is activated, otherwise the XST is disabled.
Rev. 1.70
10
July 16, 2003
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