Motorola DSP56600 Manual page 48

org p:I_SI0RD
movep x:<<M_RX0,x:(r4)+
bset #22,m4
org p:I_SI0TD
movep x:(r5)+,x:<<M_TX0
bset #22,m5
....
<somewhere in the program>
org p: INITIALIZE
move #RECIEVE_DATA_BUF,r4
move #(RECIEVE_DATA_BUF_SIZE-1),m4
bclr #22,m4
move #TRANSMIT_DATA_BUF,r5
move #(TRANSMT_DATA_BUF_SIZE-1),m5
bclr #22,m5
MOTOROLA Optimizing DSP56300/DSP56600 Applications
;essi0 receive data interrupt
;r4 - receive data buffer
;pointer
;flag for data process routine,
;using a don't care bit in the
;modifier register
;essi0 transmit data interrupt
;r5 - transmit data buffer
;pointer
;flag for data process routine
;using a don't care bit in the
;modifying register
Program Control
Using Fast Interrupts
3-19