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SM79108C40 Datasheet(PDF) 7 Page - SyncMOS Technologies,Inc

Part No. SM79108C40
Description  8-Bit Micro-controller with 8KB flash & 256 Bytes RAM embedded
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Maker  SYNCMOS [SyncMOS Technologies,Inc]
Homepage  http://www.syncmos.com.tw
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 7 page
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January 2003
Specifications subject to change without notice,contact your sales representatives for the most recent information.
7/26
Preliminary
Ver 1.0
SM79108 01/03
SyncMOS Technologies Inc.
SM79108
Preliminary
Watch Dog Timer Registers - WDT Control Register (WDTC, 9FH)
WDTE : Watch Dog Timer enable bit
CLEAR : Watch Dog Timer reset bit
PS[2:0] : Overflow period select bits
System Control Register (SCONF, 0BFH)
WDR : Watch Dog Timer Reset. When system reset by Watch Dog Timer overflow, WDR will be set to 1
ALEI : ALE output inhibit bit, to reduce EMI
Setting bit 0 (ALEI) of SCONF can inhibit the clock signal in Fosc/6Hz output to the ALE pin.
The bit 7 (WDR) of SCONF is Watch Dog Timer Reset bit. It will be set to 1 when reset signal generated by WDT overflow.
User should check WDR bit whenever unpredicted reset happened.
2. Reduce EMI Function
The SM79108 allows user to reduce the EMI emission by setting 1 to the bit 0 (ALEI) of SCONF register. This function will
inhibit the clock signal in Fosc/6Hz output to the ALE pin.
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:
000
*
*
000
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
bit-7
bit-0
WDR
Unused
Unused
Unused
Unused
Reserved
Unused
ALEI
Read / Write:
R/W
-
-
-
-
-
-
R/W
Reset value:
0
****
*
*
0




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