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參數(shù)資料
| 型號(hào)： | ST92186B3BK |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PDIP32 |
| 封裝： | PLASTIC, SDIP-32 |
| 文件頁(yè)數(shù)： | 115/148頁(yè) |
| 文件大小： | 1664K |
| 代理商： | ST92186B3BK |
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ST92186B - TIMER/WATCHDOG (WDT)
TIMER/WATCHDOG (Cont’d)
7.1.2 Functional Description
7.1.2.1 External Signals
An interrupt, generated when the WDT is running
as the 16-bit Timer/Counter, can be used as a Top
Level Interrupt or as an interrupt source connected
to channel A0 of the external interrupt structure
(replacing the INT0 interrupt input).
The counter is driven by an internal clock equal to
INTCLK divided by 4.
7.1.2.2 Initialisation
The prescaler (WDTPR) and counter (WDTRL,
WDTRH) registers must be loaded with initial val-
ues before starting the Timer/Counter. If this is not
done, counting will start with reset values.
7.1.2.3 Start/Stop
The ST_SP bit enables downcounting. When this
bit is set, the Timer will start at the beginning of the
following instruction. Resetting this bit stops the
counter.
If the counter is stopped and restarted, counting
will resume from the last value unless a new con-
stant has been entered in the Timer registers
(WDTRL, WDTRH).
A new constant can be written in the WDTRH,
WDTRL, WDTPR registers while the counter is
running. The new value of the WDTRH, WDTRL
registers will be loaded at the next End of Count
(EOC) condition while the new value of the
WDTPR register will be effective immediately.
End of Count is when the counter is 0.
When Watchdog mode is enabled the state of the
ST_SP bit is irrelevant.
7.1.2.4 Single/Continuous Mode
The S_C bit allows selection of single or continu-
ous mode.This Mode bit can be written with the
Timer stopped or running. It is possible to toggle
the S_C bit and start the counter with the same in-
struction.
Single Mode
On reaching the End Of Count condition, the Timer
stops, reloads the constant, and resets the Start/
Stop bit. Software can check the current status by
reading this bit. To restart the Timer, set the Start/
Stop bit.
Note: If the Timer constant has been modified dur-
ing the stop period, it is reloaded at start time.
Continuous Mode
On reaching the End Of Count condition, the coun-
ter automatically reloads the constant and restarts.
It is stopped only if the Start/Stop bit is reset.
7.1.3 Watchdog Timer Operation
This mode is used to detect the occurrence of a
software fault, usually generated by external inter-
ference or by unforeseen logical conditions, which
causes the application program to abandon its
normal sequence of operation. The Watchdog,
when enabled, resets the MCU, unless the pro-
gram executes the correct write sequence before
expiry of the programmed time period. The appli-
cation program must be designed so as to correct-
ly write to the WDTLR Watchdog register at regu-
lar intervals during all phases of normal operation.
7.1.3.1 Starting the Watchdog
In Watchdog mode the Timer is clocked by
INTCLK/4.
If the Watchdog is software enabled, the time base
must be written in the timer registers before enter-
ing Watchdog mode by resetting the WDGEN bit.
Once reset, this bit cannot be changed by soft-
ware.
If the Watchdog is hardware enabled, the time
base is fixed by the reset value of the registers.
Resetting WDGEN causes the counter to start, re-
gardless of the value of the Start-Stop bit.
In Watchdog mode, only the Prescaler Constant
may be modified.
If the End of Count condition is reached a System
Reset is generated.
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PDF描述 |
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| ST92195B2T1/XXX | 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP64 |
| ST92195B3B1/XXX | 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PDIP56 |
| ST92195B4B1/XXX | 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PDIP56 |
| ST92195B5T1/XXX | 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP64 |
| ST92195B6T1/XXX | 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP64 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST92195 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:32-64K ROM HCMOS MCU WITH ON-SCREEN-DISPLAY AND TELETEXT DATA SLICER |
| ST92195B | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:32-64K ROM HCMOS MCU WITH ON-SCREEN-DISPLAY AND TELETEXT DATA SLICER |
| ST92195B1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:32-64K ROM HCMOS MCU WITH ON-SCREEN-DISPLAY AND TELETEXT DATA SLICER |
| ST92195B1B1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:32-64K ROM HCMOS MCU WITH ON-SCREEN-DISPLAY AND TELETEXT DATA SLICER |
| ST92195B1T1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:32-64K ROM HCMOS MCU WITH ON-SCREEN-DISPLAY AND TELETEXT DATA SLICER |
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