參數(shù)資料
型號: W83L951DG
廠商: Nuvoton Technology Corporation of America
文件頁數(shù): 77/112頁
文件大小: 0K
描述: IC EMBEDDED CNTRLR 128-LQFP
標(biāo)準(zhǔn)包裝: 90
系列: W83
核心處理器: 8051
芯體尺寸: 8-位
速度: 24MHz
連通性: 主機(jī)接口,PS/2,SMBus,UART/USART
外圍設(shè)備: PWM,WDT
輸入/輸出數(shù): 104
程序存儲器容量: 64KB(64K x 8)
程序存儲器類型: 閃存
RAM 容量: 2K x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b; D/A 2x8b
振蕩器型: 外部
工作溫度: 0°C ~ 70°C
封裝/外殼: 128-LQFP
包裝: 托盤
W83L951DG/W83L951FG
6.7
Watch Dog Block
The watchdog timer gives a mean of returning to the reset state when a program cannot run on a
normal loop (for example, because of a software run-away). The watchdog timer consists of an 8-bit
timer L and an 8-bit timer H. At reset or writing to the watchdog timer control register WDTCON [7]
(START), each watchdog timer H and L is set to 0FFh.
About Watchdog timer H count size selection, we can use Bit 5 of the watchdog timer control register
(SIZE) permits selecting a watchdog timer H count source. When this bit is set to LOW, the count
source becomes the underflow signal of watchdog timer L.
Table 6-15.Watch Dog Register Define
WATCH DOG BLOCK(1)
EXTADDR
NAME
7
6
5
4
3
2
1
0
00
WDTCON
START
INTTYPE
SIZE
Clock Prescale Number[4:0]
01
WDTSTS
Reserved
+WDT
Gray: Only with System Reset (Pin Reset + WDT Reset) to Initial.
+: Only with Pin Reset to Initial
6.7.1
Register Description
6.7.1.1
Watch Dog Control Register (WDTCON) (Default Value: 0000_0000)
Reset with Power Reset & Pin Reset.
Bit 7: Start
1: Start / Reload
0: Stop
This Bit permits enable/disable the watchdog timer. Write LOW to this bit, the watchdog timer is
stopped. Write HIGH to this bit will reload the watchdog timer (watchdog timer H and L is set to 0FFh)
even this bit is already be HIGH. After written HIGH, the watchdog timer is running. Once this timer is
timed-out the chip is reset. Also the watchdog timer is stopped to prevent the next time-out.
Bit 6: Interrupt Type
1: NMI
0: Hardware reset
Bit 5: Size
Select the counter size. The counter starts from low to overflow. Then generate interrupt or hardware
reset.
1: One Byte Counter.
Frequency
Count
256
Limit
Timeout
WDT
.
0: Two Byte Counter.
Frequency
Count
65536
Limit
Timeout
WDT
.
Publication Release Date: August 2006
- 63 -
Revision 1.0
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