Hello

Env: SXKey Rev E, SXKey52 V1.20, SX Chip SX52BD/PQ AB0022AT, 10 MHz crysta=
l oscillator.

I have a problem which is about to drive me crazy.

I set a breakpoint at address 0x8b5 in the following piece of code:

8B0- 01D                bank            EECTRL
8B1- 076                clr             EECTRL
8B2- 02D                mov             TMP3,w
8B3- 20B 03A            mov             EESXADR,TMP1
8B5- 20C                mov             w,TMP2          ;TMP2 is at location $0c
8B6- 03B                mov             EEBYTECOUNT,w
8B7- 20D                mov             w,TMP3
8B8- 70A                sb              f_EE_READ_BLOCK_0
8B9- A55                jmp             eeprom_write
8BA- A76                jmp             eeprom_read

Sometimes when the program stops at this breakpoint (when instruction mov =
w,TMP2 has been
executed) W is loaded with a different value from what is at location TMP2=
 (as indicated by the
SX key)! Since TMP2 is at location $0c the bank selection bits are ignored=
 for this load and can't
be the source of my problem.

When W is loaded with the wrong value RTCC indicates that the ISR has just=
 been executed.
The only source of interrupt is the RTCC rollover interrupt. The ISR is ex=
ited with mov w,#-130,
retiw so this should not be the source if my problem either.

I have tried to set the breakpoint at the instruction at 0x8b3 and stepped=
 through the ISR when
the rollover interrupt has occurred right after this instruction but have =
found no problem.

What could cause this behavior?

Ruben=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D
Ruben J=F6nsson
AB Liros Electronic
Box 9124, 200 39 Malm=F6, Sweden
TEL INT +46 40142078
FAX INT +46 40947388
ruben@pp.sbbs.se
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D

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