Externally defined symbols in Bit instructions

john5 · ‎2003-04-16

Posted on April 16, 2003 at 14:09

john5 · ‎2003-04-15

Posted on April 16, 2003 at 08:54

Hi All,

I am trying to use an externally defined public symbol

SerDet

in several modules which incorporate the instruction

btjt PADR,#SerDet,labelX

When I try to assemble the modules under STDV7 assembler I get error message saying ''unknown addressing mode'' and assembly fails

This only appears to happen with the BIT class of instructions

Can anyone help - its driving me crazy

Thanks in advance

johno

sjo · ‎2003-04-16

Posted on April 16, 2003 at 14:09

What you are trying to do is invalid.

The position part the the btjt/btjf has to be a constant 0-7.

you could use a define,eg.

#define BIT 1

btjt PADR, #BIT, * ; wait for falling edge on PA1

Regards

Spen