參數(shù)資料
型號： UPD17201A
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND A/D CONVERTER FOR INFRARED REMOTE CONTROL TRANSMITTERS
中文描述： 4位單片機(jī)與LCD控制器/驅(qū)動器和A / D轉(zhuǎn)換器紅外遙控遞質(zhì)
文件頁數(shù)： 43/120頁
文件大小： 516K
代理商： UPD17201A
μ
PD17201A, 17207
43
8.
WATCH TIMER/WATCHDOG TIMER
The watch timer is used to generate a watch interrupt signal and a signal to reset the watchdog timer.
8.1
CONFIGURATION OF WATCH TIMER/WATCHDOG TIMER
Figure 8-1 shows the functional block diagram of the watch timer/watchdog timer.
As shown in Fig. 8-1, the watch timer consists of two selectors, A and B, and a frequency divider. Selector A selects
the divided output (f
X
/2
7
) of the 32.768-kHz subclock oscillator (XT) output or of the main clock oscillator (X) output
as the source clock by using mask option. Selector B selects a frequency to be used as an interrupt signal. The divider
creates a frequency of the source clock.
Resetting the watch timer and the operation of selector B is controlled by WTMRES (address 03H, bit 1) and
WTMMD (address 03H, bit 2) of the register file.
The watchdog timer is reset by WDTRES (address 03H, bit 3) of the register file.
If the subclock (f
XT
) is the source clock, the watch timer count cannot be stopped. Therefore, the subclock does
not stop but continues to oscillate even when the CPU is in the STOP mode.
If the divided output of the main clock (f
X
/2
7
) is the source clock (when the subclock is not used), the watch timer
stops when the CPU is set in the STOP mode.
Fig. 8-1 Configuration of Watch Timer/Watchdog Timer
Remark
( ) indicates the value when the subclock is used.
Note
The source clock of the watch timer/watchdog timer is fixed as follows by mask option:
1
When subclock is selected by mask option
The source clock is fixed to the subclock.
2
When subclock is not selected by mask option
The source clock is fixed to f
X
/2
7
W
T
M
M
D
W
D
T
R
E
S
W
T
M
R
E
S
LCD controller / driver
S
S
N
Sub clock f
XT
(32.768 kHz)
f
w
(32.768 kHz)
Main clock f
x
1/2
11
division
1/2
division
1/2
division
Frequency divider
f
W
/2
13
(4 Hz)
f
w
/2
11
(16 Hz)
f
w
/2
14
(2 Hz)
WDOUT
IRQWTM
RF:
Address 3FH
1/2
division
1
7
d
f
w
/2
13
(4 Hz)
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