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HT56R22 Datasheet(PDF) 35 Page - Holtek Semiconductor Inc

Part # HT56R22
Description  TinyPowerTM A/D Type 8-Bit OTP MCU with DAC
Download  127 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT56R22 Datasheet(HTML) 35 Page - Holtek Semiconductor Inc

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HT56R22/HT56R23/HT56R24/HT56R25/HT56R26
Rev. 1.30
35
December 26, 2014
M I S C R e g i s t e r
b 7
W D T E N 0
b 0
W D T E N 1
P A 0 ~ P A 3 O p e n D r a i n C o n t r o l
- d e s c r i b e d e l s e w h e r e
W a t c h d o g T i m e r E n a b l e C o n t r o l
O D E 0
W D T E N 3
1
W D T E N 2
W D T E N 3
O D E 1
O D E 2
O D E 3
W D T E N 2
0
W D T E N 1
1
W D T E N 0
0
d i s a b l e
e n a b l e
a l l o t h e r v a l u e s
Watchdog Timer Software Control
- MISC
If the fSYS/4 clock is used as the Watchdog Timer clock
source, it should be noted that when the system enters
the Power Down Mode, then the instruction clock is
stopped and the Watchdog Timer will lose its protecting
purposes. For systems that operate in noisy environ-
ments, using the LIRC oscillator is strongly recom-
mended.
Under normal program operation, a Watchdog Timer
time-out will initialise a device reset and set the status bit
TO. However, if the system is in the Power Down Mode,
when a Watchdog Timer time-out occurs, the TO bit in
the status register will be set and only the Program
Counter and Stack Pointer will be reset. Three methods
can be adopted to clear the contents of the Watchdog
Timer. The first is an external hardware reset, which
means a low level on the RES pin, the second is using
the watchdog software instructions and the third is via a
²HALT² instruction.
Clearing the Watchdog Timer
There are two methods of using software instructions to
clear the Watchdog Timer, one of which must be chosen
by configuration option. The first option is to use the sin-
gle
²CLR WDT² instruction while the second is to use the
two commands
²CLR WDT1² and ²CLR WDT2². For the
first option, a simple execution of
²CLR WDT² will clear
the WDT while for the second option, both
²CLR WDT1²
and
²CLR WDT2² must both be executed to successfully
clear the Watchdog Timer. Note that for this second op-
tion, if
²CLR WDT1² is used to clear the Watchdog Timer,
successive executions of this instruction will have no ef-
fect, only the execution of a
²CLR WDT2² instruction will
clear the Watchdog Timer. Similarly after the
²CLR
WDT2
² instruction has been executed, only a successive
²CLR WDT1² instruction can clear the Watchdog Timer.


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