参数资料
型号: TMP86C847UG
厂商: Toshiba Corporation
英文描述: Zener Diode; Application: General; Pd (mW): 500; Vz (V): 15.7 to 16.5; Condition Iz at Vz (mA): 5; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: DO-35
中文描述: 8位微控制器
文件页数: 66/160页
文件大小: 1541K
代理商: TMP86C847UG
Page 58
7. Watchdog Timer (WDT)
7.2 Watchdog Timer Control
TMP86C847UG
7.2
Watchdog Timer Control
The watchdog timer is controlled by the watchdog timer control registers (WDTCR1 and WDTCR2). The watch-
dog timer is automatically enabled after the reset release.
7.2.1
Malfunction Detection Methods Using the Watchdog Timer
The CPU malfunction is detected, as shown below.
1. Set the detection time, select the output, and clear the binary counter.
2. Clear the binary counter repeatedly within the specified detection time.
If the CPU malfunctions such as endless loops or the deadlock conditions occur for some reason, the watch-
dog timer output is activated by the binary-counter overflow unless the binary counters are cleared. When
WDTCR1<WDTOUT> is set to “1” at this time, the reset request is generated and the
RESET
pin outputs a
low-level signal, then internal hardware is initialized. When WDTCR1<WDTOUT> is set to “0”, a watchdog
timer interrupt (INTWDT) is generated.
The watchdog timer temporarily stops counting in the STOP mode including the warm-up or IDLE/SLEEP
mode, and automatically restarts (continues counting) when the STOP/IDLE/SLEEP mode is inactivated.
Note:The watchdog timer consists of an internal divider and a two-stage binary counter. When the clear code 4EH
is written, only the binary counter is cleared, but not the internal divider. The minimum binary-counter overflow
time, that depends on the timing at which the clear code (4EH) is written to the WDTCR2 register, may be 3/
4 of the time set in WDTCR1<WDTT>. Therefore, write the clear code using a cycle shorter than 3/4 of the
time set to WDTCR1<WDTT>.
Example :Setting the watchdog timer detection time to 2
21
/fc [s], and resetting the CPU malfunction detection
LD
(WDTCR2), 4EH
: Clears the binary counters.
LD
(WDTCR1), 00001101B
: WDTT
10, WDTOUT
1
LD
(WDTCR2), 4EH
: Clears the binary counters (always clears immediately before and
after changing WDTT).
Within 3/4 of WDT
detection time
:
:
LD
(WDTCR2), 4EH
: Clears the binary counters.
Within 3/4 of WDT
detection time
:
:
LD
(WDTCR2), 4EH
: Clears the binary counters.
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TMP86CH06AUG Zener Diode; Application: General; Pd (mW): 200; Vz (V): 3.87 to 4.10; Condition Iz at Vz (mA): 5; C (pF) max: -; Condition VR at C (V): &#160; ESD (kV) min: -; Package: MPAK
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TMP86CH22UG Zener Diode; Application: General; Pd (mW): 200; Vz (V): 4.15 to 4.34; Condition Iz at Vz (mA): 5; C (pF) max: -; Condition VR at C (V): &#160; ESD (kV) min: -; Package: MPAK
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