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HD6432138SW Datasheet(PDF) 440 Page - Renesas Technology Corp

Part # HD6432138SW
Description  Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series
PDF  1061 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6432138SW Datasheet(HTML) 440 Page - Renesas Technology Corp

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Section 14 Watchdog Timer (WDT)
Rev. 4.00 Jun 06, 2006 page 386 of 1004
REJ09B0301-0400
14.5.5
OVF Flag Clear Condition
To clear OVF flag in WOVI handling routine, read TCSR when OVF=1, then write with 0 to
OVF, as stated above. When WOVI is masked and OVF flag is poling, if contention between OVF
flag set and TCSR read is occurred, OVF=1 is read but OVF can not be cleared by writing with 0
to OVF.
In this case, reading TCSR when OVF=1 two times meet the requirements of OVF clear condition.
Please read TCSR when OVF=1 two times before writing with 0 to OVF.
LOOP
BTST.B
#7,@TCSR
; OVF flag read
BEQ
LOOP
; if OVF=1, exit from loop
MOV.B
@TCSR,R0L
; OVF=1 read again
MOV.W
#H’A521,R0
; OVF flag clear
MOV.W
R0,@TCSR
; :



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