参数资料
型号: UPD78F9510GR-JJG-A
厂商: Renesas Electronics America
文件页数: 60/175页
文件大小: 0K
描述: MCU 8BIT SGL CHIP 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: 1KB(1K 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
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 16-SSOP(0.173",4.40mm 宽)
包装: 托盘
CHAPTER 8 WATCHDOG TIMER
User’s Manual U16994EJ6V0UD
150
Cautions 2. After reset is released, WDTM can be written only once by an 8-bit memory
manipulation instruction.
If writing is attempted a second time, an internal reset
signal is generated. However, at the first write, if “1” and “x” are set for WDCS4 and
WDCS3 respectively and the watchdog timer is stopped, then the internal reset
signal does not occur even if the following are executed.
Second write to WDTM
1-bit memory manipulation instruction to WDTE
Writing of a value other than “ACH” to WDTE
3. WDTM cannot be set by a 1-bit memory manipulation instruction.
4. When using the flash memory programming by self programming, set the overflow
time for the watchdog timer so that enough overflow time is secured (Example 1-
byte writing: 200
μs MIN., 1-block deletion: 10 ms MIN.).
Remarks 1. fRL: Low-speed internal oscillation clock oscillation frequency
2. fX: System clock oscillation frequency
3.
×: Don’t care
4. Figures in parentheses apply to operation at fRL = 480 kHz (MAX.), fX = 10 MHz.
(2) Watchdog timer enable register (WDTE)
Writing ACH to WDTE clears the watchdog timer counter and starts counting again.
This register can be set by an 8-bit memory manipulation instruction.
Reset signal generation sets this register to 9AH.
Figure 8-3. Format of Watchdog Timer Enable Register (WDTE)
0
1
2
3
4
5
6
7
Symbol
WDTE
Address: FF49H
After reset: 9AH
R/W
Cautions 1. If a value other than ACH is written to WDTE, an internal reset signal is generated.
2. If a 1-bit memory manipulation instruction is executed for WDTE, an internal reset
signal is generated.
3. The value read from WDTE is 9AH (this differs from the written value (ACH)).
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