參數(shù)資料
型號(hào): μPD78F9217Y
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): 57/148頁
文件大小: 621K
代理商: ΜPD78F9217Y
Preliminary Product Information
57
μ
PD78F9217Y
7.6.3 Watchdog timer control registers
The following two types of registers are used to control the watchdog timer.
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 manipulated using an 8-bit memory manipulation instruction.
A RESET input clears TCL2 to 00H.
Figure 7-26. Format of Timer Clock Selection Register 2
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
CC
/2
4
f
CC
/2
6
f
CC
/2
8
f
CC
/2
10
Not to be set
(250 kHz)
(62.5 kHz)
(15.6 kHz)
(3.9 kHz)
(512 s)
(2.05 ms)
(8.19 ms)
(32.8 ms)
Other settings
TCL20
0
0
0
0
2
11
/f
CC
2
13
/f
CC
2
15
/f
CC
2
17
/f
CC
Remarks 1.
f
CC
: Main system clock oscillation frequency
2.
The parenthesized values apply to operation at f
CC
= 4.0 MHz.
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