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SMBP2501BPB Datasheet(PDF) 74 Page - SONiX Technology Company

Part # SMBP2501BPB
Description  8-Bit Micro-Controller
PDF  107 Pages
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Manufacturer  SONIX [SONiX Technology Company]
Direct Link  http://www.sonix.com.tw
Logo SONIX - SONiX Technology Company

SMBP2501BPB Datasheet(HTML) 74 Page - SONiX Technology Company

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SN8P2501B
8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 74
Version 2.1
8
8
8 TIMERS
8.1 WATCHDOG TIMER
The watchdog timer (WDT) is a binary up counter designed for monitoring program execution. If the program goes into
the unknown status by noise interference, WDT overflow signal raises and resets MCU. Watchdog clock controlled by
code option and the clock source is internal low-speed oscillator (16KHz
@3V, 32KHz
@5V).
Watchdog overflow time = 8192 / Internal Low-Speed oscillator (sec).
VDD
Internal Low RC Freq.
Watchdog Overflow Time
3V
16KHz
512ms
5V
32KHz
256ms
Note: If watchdog is “Always_On” mode, it keeps running event under power down mode or green
mode.
Watchdog clear is controlled by WDTR register. Moving 0x5A data into WDTR is to reset watchdog timer.
0CCH
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
WDTR
WDTR7
WDTR6
WDTR5
WDTR4
WDTR3
WDTR2
WDTR1
WDTR0
Read/Write
W
W
W
W
W
W
W
W
After reset
0
0
0
0
0
0
0
0
Example: An operation of watchdog timer is as following. To clear the watchdog timer counter in the top
of the main routine of the program.
Main:
MOV
A,#5AH
; Clear the watchdog timer.
B0MOV
WDTR,A
…
CALL
SUB1
CALL
SUB2
…
…
…
JMP
MAIN



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