參數(shù)資料
型號: UPD78F9211CS-CAB-A
廠商: Renesas Electronics America
文件頁數(shù): 55/175頁
文件大?。?/td> 0K
描述: MCU 8BIT 2KB FLASH 16PIN
標準包裝: 400
系列: 78K0S/Kx1+
核心處理器: 78K0S
芯體尺寸: 8-位
速度: 10MHz
外圍設備: LVD,POR,PWM,WDT
輸入/輸出數(shù): 13
程序存儲器容量: 2KB(2K x 8)
程序存儲器類型: 閃存
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 4x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 16-DIP(0.300",7.62mm)
包裝: 托盤
User’s Manual U16994EJ6V0UD
146
CHAPTER 8 WATCHDOG TIMER
8.1
Functions of Watchdog Timer
The watchdog timer is used to detect an inadvertent program loop. If a program loop is detected, an internal reset
signal is generated.
When a reset occurs due to the watchdog timer, bit 4 (WDTRF) of the reset control flag register (RESF) is set to 1.
For details of RESF, see CHAPTER 12 RESET FUNCTION.
Table 8-1. Loop Detection Time of Watchdog Timer
Loop Detection Time
During Low-Speed Internal oscillation Clock Operation
During System Clock Operation
2
11/fRL (4.27 ms)
2
13/fX (819.2
μs)
2
12/fRL (8.53 ms)
2
14/fX (1.64 ms)
2
13/fRL (17.07 ms)
2
15/fX (3.28 ms)
2
14/fRL (34.13 ms)
2
16/fX (6.55 ms)
2
15/fRL (68.27 ms)
2
17/fX (13.11 ms)
2
16/fRL (136.53 ms)
2
18/fX (26.21 ms)
2
17/fRL (273.07 ms)
2
19/fX (52.43 ms)
2
18/fRL (546.13 ms)
2
20/fX (104.86 ms)
Remarks 1. fRL: Low-speed internal oscillation clock oscillation frequency
2. fX: System clock oscillation frequency
3. Figures in parentheses apply to operation at fRL = 480 kHz (MAX.), fX = 10 MHz.
The operation mode of the watchdog timer (WDT) is switched according to the option byte setting of the on-chip
low-speed internal oscillator as shown in Table 8-2.
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