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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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HD6432142 Scheda tecnica(PDF) 466 Page - Renesas Technology Corp |
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HD6432142 Scheda tecnica(HTML) 466 Page - Renesas Technology Corp |
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466 / 1177 page  Section 14 Watchdog Timer (WDT) Rev. 4.00 Sep 27, 2006 page 422 of 1130 REJ09B0327-0400 Caution is therefore required when using WDT1 as the realtime clock counter. No error occurs in the counter value while WDT1 is operating in the same mode. 14.5.6 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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