#build generates wrong address

Ian McCrum · Joined: 26 Oct 2003 Posts: 14 Location: Northern Ireland

The code below generates the machine code listed ... the #build address is 4k too low, I had expected the jump at 0xE000 to be at 0xF000.
Is there proper documentation for the #build command?

__

#include <18C801.h>
#build (RESET=0xF000)
#org 0xF020,0xF0FF default
#pragma use fast_io(A)
#pragma byte PORTA=0xF80
#pragma bit LED=PORTA.2

void main() {
do{LED=0;LED=1;}while(1);
}
__

E000 EF10 F078 00001 GOTO F020
...
F020 6AF8 00313 CLRF FF8
F022 8ED0 00314 BSF FD0.7
F024 6AEA 00315 CLRF FEA
F026 6AE9 00316 CLRF FE9
F028 0E07 00317 MOVLW 07
F02A 6EC1 00318 MOVWF FC1
0000 00319 .................... do{LED=0;LED=1;}while(1);
F02C 9480 00320 BCF F80.2
F02E 8480 00321 BSF F80.2
F030 EF16 F078 00322 GOTO F02C
F034 0003 0325 SLEEP

__

oops. just spotted the code doesn't work anyway ... I forgot the TRIS
But it is #build I am wondering about...

TIA
Ian
_________________
Ian McCrum, email address held at
www.eej.ulst.ac.uk/~ian

Ian McCrum · Joined: 26 Oct 2003 Posts: 14 Location: Northern Ireland

Just spotted that #build (RESET=0xF000)
will multiply that address by 2, it assumes the operand is a word address
I guess. Now 0xF000 * 2 is 0x1E000, a byte address

And again the #build is only holding a 64k number... <sigh>
a bug?

I am using PCH 3.120
regards
Ian
_________________
Ian McCrum, email address held at
www.eej.ulst.ac.uk/~ian