参数资料
型号: mPD789322
厂商: NEC Corp.
元件分类: 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位微控制器与2/4/8K字节在系统可编程闪存
文件页数: 38/96页
文件大小: 482K
代理商: MPD789322
Preliminary Product Information U14673EJ1V0PM00
43
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
WTM1
WTM0
FF4AH
00H
R/W
WTM7
Watch timer count clock (fW) selection
0
fX/2
7
(39.1 kHz)
1fXT
(32.768 kHz)
WTM6
WTM5
WTM4
Prescaler interval time selection
00
0
2
4
/fW
00
1
2
5
/fW
01
0
2
6
/fW
01
1
2
7
/fW
10
0
2
8
/fW
10
1
2
9
/fW
Other than above
Setting prohibited
WTM1
5-bit counter operation control
0
Cleared after operation stopped
1Start
WTM0
Watch timer operation enable
0
Operation stopped (both prescaler and timer cleared)
1
Operation enabled
Remarks 1. fW: Watch timer clock frequency (fX/2
7 or fXT)
2. fX: Main system clock oscillation frequency
3. fXT: Subsystem clock oscillation frequency
4. The parenthesized values apply to operation at fX = 5.0 MHz or fXT = 32.768 kHz.
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