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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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FS6407 데이터시트(PDF) 36 Page - NXP Semiconductors |
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FS6407 데이터시트(HTML) 36 Page - NXP Semiconductors |
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36 / 111 page  36 NXP Semiconductors FS6407/FS6408 6.5.2.6 Watchdog refresh counter The watchdog refresh counter is used to decrement the RST error counter. Each time the watchdog is properly refreshed, the watchdog refresh counter is incremented by “1”. Each time the watchdog refresh counter reaches “6” and if next WD refresh is also good, the RST error counter is decremented by “1” (case with WD_CNT_refresh_1:0 configured at 6). Whatever the position is in the watchdog refresh counter, each time there is a wrong refresh watchdog, the watchdog refresh counter is reset to “0”. To allow flexibility in the application, the maximum value of this watchdog refresh counter is configurable in the INIT_WD register, but only when device is in INIT FS mode. Figure 15. Watchdog refresh counter configuration (INIT_WD register, WD_CNT_refresh_1:0) Any access to the watchdog register during the “closed” watchdog window is considered as a wrong watchdog refresh. Watchdog timeout, meaning no WD refresh during closed or open windows, is considered as a wrong WD refresh. Table 10. Watchdog error table WINDOW CLOSED OPEN BAD Key WD_NOK WD_NOK SPI GOOD Key WD_NOK WD_OK None (time out) No_issue WD_NOK 0 2 1 3 4 WD Refresh OK Watchdog Refresh Counter WD_CNT_refresh = 4 WD Refresh OK WD Refresh OK WD Refresh OK WD Refresh NOK WD Refresh NOK / WD_OFF WD Refresh NOK / WD_OFF WD Refresh NOK / WD_OFF WD Refresh OK / WD Refresh NOK / WD_OFF 0 2 1 3 4 5 6 WD Refresh OK Watchdog Refresh Counter WD_CNT_refresh = 6 WD Refresh OK WD Refresh OK WD Refresh OK WD Refresh OK WD Refresh OK WD Refresh NOK WD Refresh NOK / WD_OFF WD Refresh NOK / WD_OFF WD Refresh NOK / WD_OFF WD Refresh NOK / WD_OFF WD Refresh NOK / WD_OFF WD Refresh OK / WD Refresh NOK / WD_OFF 0 1 WD Refresh OK Watchdog Refresh Counter WD_CNT_refresh = 1 WD Refresh NOK WD Refresh OK / WD Refresh NOK / WD_OFF 0 Watchdog Refresh Counter WD_CNT_refresh = 2 WD Refresh NOK 2 1 WD Refresh NOK / WD_OFF WD Refresh OK / WD Refresh NOK / WD_OFF WD Refresh OK WD Refresh OK |
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