參數(shù)資料
型號: μPD789417
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機(jī)微控制器(8位單片微控制器)
文件頁數(shù): 52/126頁
文件大?。?/td> 590K
代理商: ΜPD789417
52
μ
PD789415, 789416, 789417
5.6.3 Watchdog timer control registers
The watchdog timer is controlled by the following registers.
Timer clock selection register 2 (TCL2)
Watchdog timer mode register (WDTM)
(1) Timer clock selection register 2 (TCL2)
TCL2 specifies the count clock for the watchdog timer.
TCL2 is set using an 8-bit memory manipulation instruction.
A RESET input clears TCL2 to 00H.
Figure 5-23. Timer Clock Selection Register 2 Format
TCL22
0
0
1
1
Watchdog timer count clock selection
Interval time
0
0
0
0
0
TCL22 TCL21 TCL20
TCL2
Symbol
Address
When reset
R/W
FF42H
00H
R/W
7
6
5
4
3
2
1
0
TCL21
0
1
0
1
f
X
/2
4
f
X
/2
6
f
X
/2
8
f
X
/2
10
Not to be specified
(312.5 kHz)
(78.1 kHz)
(19.5 kHz)
(4.88 kHz)
(410 s)
(1.64 ms)
(6.55 ms)
(26.2 ms)
Other settings
TCL20
0
0
0
0
2
11
/f
X
2
13
/f
X
2
15
/f
X
2
17
/f
X
Remarks 1.
f
X
: Main system clock oscillation frequency
2.
The parenthesized values apply to operation at f
X
= 5.0 MHz.
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