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PFS154 bảng dữ liệu(PDF) 34 Page - PADAUK Technology.

tên linh kiện PFS154
Giải thích chi tiết về linh kiện  8bit MTP Type IO controller
PDF  91 Pages
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nhà sản xuất  PADAUK [PADAUK Technology.]
Trang chủ  http://www.padauk.com.tw/
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PFS154 bảng dữ liệu(HTML) 34 Page - PADAUK Technology.

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PFS154
8bit MTP Type IO Controller
©Copyright 2020, PADAUK Technology Co. Ltd
Page 34 of 91
PDK-DS-PFS154_CN_V105 –Jun. 9, 2020
5.6. Watchdog Timer
The watchdog timer (WDT) is a counter with clock coming from ILRC. WDT can be cleared by power-on-reset
or by command wdreset at any time. There are four different timeout periods of watchdog timer can be chosen
by setting the misc register, it is:
 8k ILRC clock period when misc[1:0]=00 (default)
 16k ILRC clock period when misc[1:0]=01
 64k ILRC clock period when misc[1:0]=10
 256k ILRC clock period when misc[1:0]=11
The frequency of ILRC may drift a lot due to the variation of manufacture, supply voltage and temperature; user
should reserve guard band for safe operation. Besides, the watchdog period will also be shorter than expected
after Reset or Wakeup events. It is suggested to clear WDT by wdreset command after these events to ensure
enough clock periods before WDT timeout.
When WDT is timeout, PFS154 will be reset to restart the program execution. The relative timing diagram of
watchdog timer is shown as Fig. 5.
VDD
WD
Time Out
Program
Execution
tSBP
Watch Dog Time Out Sequence
VDD
WD
Time Out
Program
Execution
tSBP
Watch Dog Time Out Sequence
Fig. 5: Sequence of Watch Dog Time Out



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