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FS6408 Datasheet(PDF) 39 Page - NXP Semiconductors

Part # FS6408
Description  Power system basis chip with high speed can transceiver
PDF  111 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

FS6408 Datasheet(HTML) 39 Page - NXP Semiconductors

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NXP Semiconductors
39
FS6407/FS6408
6.5.3.1
RST error counter at start-up or resuming from LPOFF mode
At start-up or when resuming from LPOFF mode the reset error counter starts at level 1 and FS0B is asserted low. To remove the
activation of FS0B, the RST error counter must go back to value “0” (seven consecutive good watchdog refresh decreases the reset error
counter down to 0) and a right command is sent to FS_OUT register (Figure 20).
Figure 18. Example of WD operation generating a reset (WD_error_cnt = 6)
Figure 19. Example of WD operation leading a decrement of the reset error counter (WD_resfresh_cnt = 6)
WD window
OK
NOK
NOK
OK
0
2
WD error
counter
4
3
NOK
5
OK
4
6
NOK
Reset error
counter
1
RSTB
0
10
WD Refresh
counter
00
1
1
0
RSTb
delay time
1st WD refresh OK after
INIT phase. Start of the
WD window
New fully OPEN window of
256 ms
6
2
0
OK
OK
OK
OK
OK
OK
OK
0
OK
1
2
3
4
5
6
0
1
1
WD window
WD error
counter
Reset error
counter
RSTb
WD Refresh
counter
RSTb
delay time
1
NOK
New fully OPEN window of
256 ms
4



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