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restart_cause()

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Torello

Joined: 29 Sep 2006
Posts: 114

restart_cause()

Posted: Sun Jan 24, 2010 6:39 am

Hi,

Looking at the compiled asm (pic18lf8627) of CCS restart_cause()
function. I don't understand several instructions. Can anyone fill in?
My comment behind asm.
Why setting status bits negative and OV?
Did CCS forget the Stack reboot causes?

Kind regards,
Edwin
PCWHD 4.103 / windows 7

Code:

006F8: MOVF FD0,W // get RCON
006FA: ANDLW 0F // Copy upper 4 bits, not RI !
006FC: BTFSS FD0.4 // test the RI (reset) flag ..
006FE: MOVLW 00 // and clear W if RI is set (reset instruction reboot)
00700: BSF FD0.0 //set BOR
00702: BSF FD0.1 //set POR
00704: BSF FD0.4 //Set RI
00706: BSF FD8.3 //Set Status reg bit OV (flag result overflow.. why?)
00708: BSF FD8.4 //Set Status reg bit N (flag result negative.. why?)
0070A: MOVLB 1
0070C: MOVWF xCC

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