> Sounds like you have had a bit of a rough time with this..

Quite

Here's a curious thing

Works

           mov     #0xff,w0
           call    send_w0
           bclr    SPI1STAT,#SPIROV
           btss    SPI1STAT,#SPIRBF
           bra     $-2
           mov     SPI1BUF,w2

send_w0:   mov     w0,SPI1BUF        ;load SPI buffer
           call    usec50            ;wait at 368.64kH
           return

Don't works -=20

           mov     #0xff,w0
           call    send_w0
           btss    SPI1STAT,#SPIRBF
           bra     $-2
           mov     SPI1BUF,w2

send_w0:   mov     w0,SPI1BUF        ;load SPI buffer
           call    usec50            ;wait at 368.64kH
           bclr    SPI1STAT,#SPIROV
           return

The difference ? The 'return' it seems

Works OK too

           mov     #0xff,w0
           call    send_w0
           bclr    SPI1STAT,#SPIROV
..... any number of cycles ....
           btss    SPI1STAT,#SPIRBF
           bra     $-2
           mov     SPI1BUF,w2

Weird

Joe
--=20
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