參數(shù)資料
型號(hào)： T89C51RB2-SLWIL
廠商： Atmel Corp.
英文描述： 8-bit Microcontroller with 16 Kbytes/ 32 Kbytes FLASH
中文描述： 8位微控制器，帶有16字節(jié)/ 32千字節(jié)閃存
文件頁數(shù)： 75/170頁
文件大?。?/td> 1927K
代理商： T89C51RB2-SLWIL
75
A/T89C51CC01
4129L–CAN–08/05
Watchdog Timer
T89C51CC01 contains a powerful programmable hardware Watchdog Timer (WDT) that
automatically resets the chip if it software fails to reset the WDT before the selected time
interval has elapsed. It permits large Time-Out ranking from 16ms to 2s @Fosc =
12MHz in X1 mode.
This WDT consists of a 14-bit counter plus a 7-bit programmable counter, a Watchdog
Timer reset register (WDTRST) and a Watchdog Timer programming (WDTPRG) regis-
ter. When exiting reset, the WDT is -by default- disable.
To enable the WDT, the user has to write the sequence 1EH and E1H into WDTRST
register no instruction in between. When the Watchdog Timer is enabled, it will incre-
ment every machine cycle while the oscillator is running and there is no way to disable
the WDT except through reset (either hardware reset or WDT overflow reset). When
WDT overflows, it will generate an output RESET pulse at the RST pin. The RESET
pulse duration is 96xT
OSC
, where T
OSC
=1/F
OSC
. To make the best use of the WDT, it
should be serviced in those sections of code that will periodically be executed within the
time required to prevent a WDT reset
Note:
When the Watchdog is enable it is impossible to change its period.
Figure 38.
Watchdog Timer
÷
6
÷
PS
CPU and Peripheral
Clock
Fwd
CLOCK
WDTPRG
RESET
Decoder
Control
WDTRST
WR
Enable
14-bit COUNTER
7-bit COUNTER
Outputs
RESET
-
-
-
-
-
2
1
0
Fwd Clock
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
T89C51RB2-SLWIM 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Microcontroller with 16 Kbytes/ 32 Kbytes FLASH
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T89C51RC2-3CBCL 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Microcontroller with 16 Kbytes/ 32 Kbytes FLASH
T89C51RC2-3CBCM 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Microcontroller with 16 Kbytes/ 32 Kbytes FLASH
T89C51RC2-3CBIL 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Microcontroller with 16 Kbytes/ 32 Kbytes FLASH
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