Inter-Integrated Circuit (I2C) Interface - The HCS12/9S12: An Introduction to Software and Hardware Interfacing - page 583

brclr IBSR,IBIF,* ; wait until the EEPROM ID is sent out

movb #IBIF,IBSR ; clear the IBIF flag

brclr IBSR,RXAK,ranRdok2 ; does EEPROM acknowledge?

ldab #$FF ; return 2 1, if EEPROM does not ackowledge

rts

ranRdok2 bset IBCR,TXAK ; prepare to send NACK

bclr IBCR,TXRX ; perform reception

ldaa IBDR ; dummy read to initiate reception

brclr IBSR,IBIF,* ; wait for a byte to shift in

movb #IBIF,IBSR ; clear the IBIF flag

bclr IBCR,MSSL ; generate a stop condition

ldaa IBDR ; get the data byte

ldab #0 ; normal read status

rts

The C language version of the function is as follows:
char EErandomRead(char ID, char addr)
{

char dummy;
SendSlaveID(ID);
if (IBSR & RXAK)
return 2 1;
IBDR 5 addr; /* send out EEPROM address */

while(!(IBSR & IBIF)); /* wait until the address is shifted out */

IBSR 5 IBIF; /* clear IBIF flag */

if (IBSR & RXAK)
return 2 1;
IBCR | 5 RSTA; /* generate restart condition */

IBDR 5 ID | 0x01; /* prepare to read */

while (!(IBSR & IBIF));
IBSR 5 IBIF;
if (IBSR & RXAK)
return 2 1;
IBCR | 5 TXAK; /* prepare to send NACK */

IBCR & 5 , TXRX; /* perform reception */

dummy 5 IBDR; /* dummy read to trigger nine clock pulses */

while(!(IBSR & IBIF)); /* wait for data to shift in */

IBSR 5 IBIF;
IBCR & 5 , MSSL; /* generate a stop condition */

return IBDR;
}

▲

Sequential read is performed in a block read operation. When the MCU saves the contents
of the IBDR register, it also initiates a sequential read if the MCU acknowledges the previously
received byte.