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ST6387 bảng dữ liệu(PDF) 22 Page - STMicroelectronics

tên linh kiện ST6387
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ST6387 bảng dữ liệu(HTML) 22 Page - STMicroelectronics

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ST6365, ST6375, ST6385 ST6367, ST6377, ST6387
HARDWARE ACTIVATED DIGITAL WATCHDOG FUNCTION (Cont’d)
Hardware Activated Watchdog Register
(HWDR)
Address: D8h - Read/Write
Reset Value: 0FEh
T1-T6. These are the watchdog counter bits. It
should be noted that D7 (T1) is the LSB of the
counter and D2 (T6) is the MSB of the counter,
these bits are in the opposite order to normal.
SR. This bit is set to one during the reset phase
and will generate a software reset if cleared to ze-
ro.
C. This is the watchdog activation bit that is hard-
ware set. The watchdog function is always activat-
ed independently of changes of value of this bit.
The register reset value is FEh (Bit 1-7 set to one,
Bit 0 cleared).
Figure 18. Hardware Activated Watchdog
Working Principle
70
T1
T2
T3
T4
T5
T6
SR
C
BIT0
VA00190
BIT1
BIT2
BIT3
BIT4
BIT5
BIT6
BIT7
8-BIT
DOWN COUNTER
OSC-12
RESET
D0
D1
D2
D3
D4
D5
D6
D7



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