参数资料
型号: UPD78F9212CS-CAB-A
厂商: Renesas Electronics America
文件页数: 59/175页
文件大小: 0K
描述: MCU 8BIT 4KB FLASH 16PIN
标准包装: 400
系列: 78K0S/Kx1+
核心处理器: 78K0S
芯体尺寸: 8-位
速度: 10MHz
外围设备: LVD,POR,PWM,WDT
输入/输出数: 13
程序存储器容量: 4KB(4K x 8)
程序存储器类型: 闪存
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 2 V ~ 5.5 V
数据转换器: A/D 4x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 16-DIP(0.300",7.62mm)
包装: 托盘
CHAPTER 8 WATCHDOG TIMER
User’s Manual U16994EJ6V0UD
149
8.3
Registers Controlling Watchdog Timer
The watchdog timer is controlled by the following two registers.
Watchdog timer mode register (WDTM)
Watchdog timer enable register (WDTE)
(1) Watchdog timer mode register (WDTM)
This register sets the overflow time and operation clock of the watchdog timer.
This register can be set by an 8-bit memory manipulation instruction and can be read many times, but can be
written only once after reset is released.
Reset signal generation sets this register to 67H.
Figure 8-2. Format of Watchdog Timer Mode Register (WDTM)
0
WDCS0
1
WDCS1
2
WDCS2
3
WDCS3
4
WDCS4
5
1
6
1
7
0
Symbol
WDTM
Address: FF48H
After reset: 67H
R/W
WDCS4
Note 1
WDCS3
Note 1
Operation clock selection
0
Low-speed internal oscillation clock (fRL)
0
1
System Clock (fX)
1
×
Watchdog timer operation stopped
Overflow time setting
WDCS2
Note 2
WDCS1
Note 2
WDCS0
Note 2
During low-speed internal
oscillation clock operation
During system clock operation
0
2
11/fRL (4.27 ms)
2
13/fX (819.2
μs)
0
1
2
12/fRL (8.53 ms)
2
14/fX (1.64 ms)
0
1
0
2
13/fRL (17.07 ms)
2
15/fX (3.28 ms)
0
1
2
14/fRL (34.13 ms)
2
16/fX (6.55 ms)
1
0
2
15/fRL (68.27 ms)
2
17/fX (13.11 ms)
1
0
1
2
16/fRL (136.53 ms)
2
18/fX (26.21 ms)
1
0
2
17/fRL (273.07 ms)
2
19/fX (52.43 ms)
1
2
18/fRL (546.13 ms)
2
20/fX (104.86 ms)
Notes 1.
If “low-speed internal oscillator cannot be stopped” is specified by the option byte, this cannot
be set.
The low-speed internal oscillation clock will be selected no matter what value is
written.
2.
Reset is released at the maximum cycle (WDCS2, 1, 0 = 1, 1, 1).
Caution
1. Set bits 7, 6, and 5 to 0, 1, and 1, respectively
. Do not set the other values.
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