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SM8954AC25 Folha de dados(PDF) 10 Page - SyncMOS Technologies,Inc

Nome de Peças SM8954AC25
Descrição Electrónicos  8-Bits Micro-controller With 16KB flash & 1KB RAM embedded
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Fabricante Electrônico  SYNCMOS [SyncMOS Technologies,Inc]
Página de início  http://www.syncmos.com.tw
Logo SYNCMOS - SyncMOS Technologies,Inc

SM8954AC25 Folha de dados(HTML) 10 Page - SyncMOS Technologies,Inc

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SyncMOS Technologies International, Inc.
SM8954A
8-Bits Micro-controller
With 16KB flash & 1KB RAM embedded
Specifications subject to change without notice contact your sales representatives for the most recent information.
Ver 2.1 SM8954A 08/2006
10
There is a 250KHz RC oscillator embedded in chip. Set WDTE = “1” will enable the RC oscillator and the frequency
is independent to the system frequency.
To enable the WDT is done by setting 1 to the bit 7 (WDTE) of WDTC. After WDTE set to 1, the 16-bit counter starts to
count with the RC oscillator. It will generate a reset signal when overflows. The WDTE bit will be cleared to 0
automatically when SM8958A been reset, either hardware reset or WDT reset.
To reset the WDT is done by setting 1 to the CLEAR bit of WDTC before the counter overflow. This will clear the
content of the 16-bit counter and let the counter re-start to count from the beginning.
3.1 Watch Dog Timer Registers:
Watch Dog Timer Registers - WDT Control Register (WDTC, $9F)
bit-7
bit-0
WDTE
R
Clear
Unused
Unused
PS2
PS1
PS0
Read / Write:
R/W
-
R/W
-
-
R/W
R/W
R/W
Reset value:
0
*
0
*
*
0
0
0
WDTE : Watch Dog Timer enable bit
CLEAR : Watch Dog Timer reset bit
PS[2:0] : Overflow period select bits
PS [2:0]
Overflow Period (ms)
000
2.048
001
4.096
010
8.192
011
16.384
100
32.768
101
65.536
110
131.072
111
262.144
Watch Dog Key Register - (WDTKEY, $97H)
bit-7
bit-0
WDT
KEY7
WDT
KEY6
WDT
KEY5
WDT
KEY4
WDT
KEY3
WDT
KEY2
WDT
KEY1
WDT
KEY0
Read / Write:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset value:
0
0
0
0
0
0
0
0


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