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參數(shù)資料
| 型號(hào)： | mPD789326 |
| 廠商： | NEC Corp. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| 中文描述： | 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存 |
| 文件頁數(shù)： | 43/96頁 |
| 文件大?。?/td> | 482K |
| 代理商： | MPD789326 |
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Preliminary Product Information U14673EJ1V0PM00
43
μ
PD789322,789324,789326,789327
5.4.3 Watch timer control register
The following register controls the watch timer.
Watch timer mode control register (WTM)
(1) Watch timer mode control register (WTM)
This register is used to enable/disable the count clock and operation of the watch timer and set the interval
time of the prescaler and operation control of the 5-bit counter.
WTM is set using a 1-bit or 8-bit memory manipulation instruction.
RESET input sets this register to 00H.
Figure 5-19. Format of Watch Timer Mode Control Register
Symbol
7
6
5
4
3
2
<1>
<0>
Address
After reset
R/W
WTM
WTM7
WTM6
WTM5
WTM4
0
0
WTM1
WTM0
FF4AH
00H
R/W
WTM7
Watch timer count clock (f
W
) selection
0
f
X
/2
7
(39.1 kHz)
1
f
XT
(32.768 kHz)
WTM6
WTM5
WTM4
Prescaler interval time selection
0
0
0
2
4
/f
W
0
0
1
2
5
/f
W
0
1
0
2
6
/f
W
0
1
1
2
7
/f
W
1
0
0
2
8
/f
W
1
0
1
2
9
/f
W
Other than above
Setting prohibited
WTM1
5-bit counter operation control
0
Cleared after operation stopped
1
Start
WTM0
Watch timer operation enable
0
Operation stopped (both prescaler and timer cleared)
1
Operation enabled
Remarks 1.
f
W
: Watch timer clock frequency (f
X
/2
2.
f
X
: Main system clock oscillation frequency
3.
f
XT
: Subsystem clock oscillation frequency
4.
The parenthesized values apply to operation at f
X
= 5.0 MHz or f
XT
= 32.768 kHz.
7
or f
XT
)
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