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GMS81032 데이터시트(PDF) 46 Page - Hynix Semiconductor

부품명 GMS81032
상세설명  8-BIT SINGLE CHIP MICROCOMPUTERS
PDF  101 Pages
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제조업체  HYNIX [Hynix Semiconductor]
홈페이지  http://www.skhynix.com/kor/main.do
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GMS81032 데이터시트(HTML) 46 Page - Hynix Semiconductor

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By assigning bit6(WDTCL) of WDTR, 6-bit counter can be cleared
-
WDTCL
WDTR5
WDTR4
WDTR3
WDTR2
WDTR1
WDTR0
WDTR
W <00C8H>
WDTCL
0
1
Watch Dog Timer Operation
Free-run
Automatically cleared, after one machine cycle
7
0
Watch Dog Timer Register
Determine Interval of IFWDT
Interval of IFWDT = Value of WDTR ¡¿ Interval of IFBIT
(Caution) : after WDTCL = 1, timer maximum error is one cycle of IFBIT.
4.1.5.2 WDT Interrupt Interval
WDT Interrupt(IFWDT) interval is determined by the interrupt IFBIT interval of Basic
Interval Timer and the value of WDT Register.
Interval of IFWDT = (IFBIT interval) * (WDTR value)
Interval of IFWDT
: 512us ¡¿ 1 = 512us (MIN>)
: 65,536us ¡¿ 63 = 4,128,768us (MAX>)
As IFBIT (Basic Interval Timer Interrupt Request) is used for input clock of WDT, Input
clock cycle is possible from 512us to 65,536us by BTS. (at fex = 4MHz)
*At Hardware reset time ,WDT starts automatically.Therefore, the user must select
the CKCTLR,WDTR before WDT overflow.
( Reset WDTR value = 0Fh,15
interval of WDT = 65,536 ¡¿ 15 = 983040 uS (about 1second ) )
Chapter 4. Peripheral Hardware



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