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參數資料
| 型號： | uPSD3234B-24U6T |
| 廠商： | 意法半導體 |
| 英文描述： | Flash Programmable System Devices with 8032 Microcontroller Core |
| 中文描述： | 閃存可編程系統設備與8032微控制器內核 |
| 文件頁數： | 47/170頁 |
| 文件大?。?/td> | 2717K |
| 代理商： | UPSD3234B-24U6T |
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uPSD3234A, uPSD3234BV, uPSD3233B, uPSD3233BV
WATCHDOG TIMER
The hardware watchdog timer (WDT) resets the
uPSD323X Devices when it overflows. The WDT
is intended as a recovery method in situations
where the CPU may be subjected to a software
upset. To prevent a system reset the timer must be
reloaded in time by the application software. If the
processor suffers a hardware/software malfunc-
tion, the software will fail to reload the timer. This
failure will result in a reset upon overflow thus pre-
venting the processor running out of control.
In the Idle Mode the watchdog timer and reset cir-
cuitry remain active. The WDT consists of a 22-bit
counter, the Watchdog Timer RESET (WDRST)
SFR and Watchdog Key Register (WDKEY).
Since the WDT is automatically enabled while the
processor is running. the user only needs to be
concerned with servicing it.
The 22-bit counter overflows when it reaches
4194304 (3FFFFFH). The WDT increments once
every machine cycle.
This means the user must reset the WDT at least
every 4194304 machine cycles (1.258 seconds at
40MHz). To reset the WDT the user must write a
value between 00-7EH to the WDRST register.
The value that is written to the WDRST is loaded
to the 7MSB of the 22-bit counter. This allows the
user to pre-loaded the counter to an initial value to
generate a flexible Watchdog time out period.
Writing a “00” to WDRST clears the counter.
The watchdog timer is controlled by the watchdog
key register, WDKEY. Only pattern 01010101
(=55H), disables the watchdog timer. The rest of
pattern combinations will keep the watchdog timer
enabled. This security key will prevent the watch-
dog timer from being terminated abnormally when
the function of the watchdog timer is needed.
In Idle Mode, the oscillator continues to run. To
prevent the WDT from resetting the processor
while in Idle, the user should always set up a timer
that will periodically exit Idle, service the WDT, and
re-enter Idle Mode.
Watchdog reset pulse width depends on the clock
frequency. The reset period is Tf
OSC
x 12 x 2
22
.
The RESET pulse width is Tf
OSC
x 12 x 2
15
.
Table 32. Watchdog Timer Key Register (WDKEY: 0AEH)
Table 33. Description of the WDKEY Bits
7
6
5
4
3
2
1
0
WDKEY7
WDKEY6
WDKEY5
WDKEY4
WDKEY3
WDKEY2
WDKEY1
WDKEY0
Bit
Symbol
Function
7 to 0
WDKEY7 to
WDKEY0
Enable or disable watchdog timer.
01010101 (=55h): disable watchdog timer. Others: enable watchdog timer
相關PDF資料 |
PDF描述 |
|---|---|
| uPSD3234B-40T1T | Flash Programmable System Devices with 8032 Microcontroller Core |
| uPSD3234B-40T6T | Flash Programmable System Devices with 8032 Microcontroller Core |
| uPSD3234B-40U1T | Flash Programmable System Devices with 8032 Microcontroller Core |
| uPSD3234B-40U6T | Flash Programmable System Devices with 8032 Microcontroller Core |
| uPSD3234BV-24T6T | Flash Programmable System Devices with 8032 Microcontroller Core |
相關代理商/技術參數 |
參數描述 |
|---|---|
| UPSD3234B-40T1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3234B-40T1T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Devices with 8032 Microcontroller Core |
| UPSD3234B-40T6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3234B-40T6T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Devices with 8032 Microcontroller Core |
| UPSD3234B-40U1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
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