Posted on May 17, 2011 at 12:09Today I discovered something I think IS a flaw: if AD conversion is started and PSEN is written after a certain number of instruction cycles (8-16), the conversion-end flag gets never set... :-?
Here is the code which stuck:
mov P1SFS,#00010000B ;set p1.4 to be ADCH0
mov ASCL,#1 ;set ADC prescaler
anl ACON,#11110011B
orl ACON,#00100010B ;bit5 - ADEN (AD enable); bits 2,3 - AD channel select (ADCH0), bit 1 = ADST startbit
nop
...
nop ;together 8-16 nops
orl pcon,#0
Loop:
mov a,ACON
jnb acc.0,StartX11 ;bit 0 - if AD conversion finished, set to 1 ;---never gets here
Again, I would be happy if somebody would try and perhaps confirm it.
Jan Waclawek
[ This message was edited by: wek1 on 18-11-2005 14:59 ]
