Analog Devices ADSP-BF506F Hardware Reference Manual page 710

Programming Examples
***********************************************************/
TRANSMIT:
CC = BITTST(R1, BITPOS(XMTSERV));
if ! CC JUMP SlaveError;
R0 = B[P4++](Z);
W[P1 + LO(TWI_XMT_DATA8)] = R0;
R0 = XMTSERV(Z);
W[P1 + LO(TWI_INT_STAT)] = R0;
ssync;
JUMP _TWI_ISR.END; /* exit */
/***********************************************************
slave transfer error
***********************************************************/
SlaveError:
CC = BITTST(R1, BITPOS(SERR));
if ! CC JUMP SlaveOverflow;
R0 = SERR(Z);
W[P1 + LO(TWI_INT_STAT)] = R0;
ssync;
JUMP _TWI_ISR.END;
/***********************************************************
slave overflow
***********************************************************/
SlaveOverflow:
CC = BITTST(R1, BITPOS(SOVF));
if !CC JUMP SlaveTransferComplete;
R0 = SOVF(Z);
W[P1 + LO(TWI_INT_STAT)] = R0;
ssync;
JUMP _TWI_ISR.END;
/***********************************************************
16-60
/* clear interrupt source bit */
/* clear interrupt source bit */
/* exit */
/* clear interrupt source bit */
/* exit */
ADSP-BF50x Blackfin Processor Hardware Reference