Chapter 15 Inter-Integrated Circuit (IICV3) Block Description
MC9S12XE-Family Reference Manual Rev. 1.21
Freescale Semiconductor
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before reading the 2nd last byte of data. Before reading the last byte of data, a STOP signal must be
generated rst. The following is an example showing how a STOP signal is generated by a master receiver.
15.7.1.5
Generation of Repeated START
At the end of data transfer, if the master continues to want to communicate on the bus, it can generate
another START signal followed by another slave address without rst generating a STOP signal. A
program example is as shown.
15.7.1.6
Slave Mode
In the slave interrupt service routine, the module addressed as slave bit (IAAS) should be tested to check
if a calling of its own address has just been received. If IAAS is set, software should set the transmit/receive
mode select bit (Tx/Rx bit of IBCR) according to the R/W command bit (SRW). Writing to the IBCR
clears the IAAS automatically. Note that the only time IAAS is read as set is from the interrupt at the end
of the address cycle where an address match occurred, interrupts resulting from subsequent data transfers
will have IAAS cleared. A data transfer may now be initiated by writing information to IBDR, for slave
transmits, or dummy reading from IBDR, in slave receive mode. The slave will drive SCL low in-between
byte transfers, SCL is released when the IBDR is accessed in the required mode.
In slave transmitter routine, the received acknowledge bit (RXAK) must be tested before transmitting the
next byte of data. Setting RXAK means an 'end of data' signal from the master receiver, after which it must
be switched from transmitter mode to receiver mode by software. A dummy read then releases the SCL
line so that the master can generate a STOP signal.
15.7.1.7
Arbitration Lost
If several masters try to engage the bus simultaneously, only one master wins and the others lose
arbitration. The devices which lost arbitration are immediately switched to slave receive mode by the
hardware. Their data output to the SDA line is stopped, but SCL continues to be generated until the end of
the byte during which arbitration was lost. An interrupt occurs at the falling edge of the ninth clock of this
transfer with IBAL=1 and MS/SL=0. If one master attempts to start transmission while the bus is being
engaged by another master, the hardware will inhibit the transmission; switch the MS/SL bit from 1 to 0
without generating STOP condition; generate an interrupt to CPU and set the IBAL to indicate that the
MASR
DEC
RXCNT
;DECREASE THE RXCNT
BEQ
ENMASR
;LAST BYTE TO BE READ
MOVB
RXCNT,D1
;CHECK SECOND LAST BYTE
DEC
D1
;TO BE READ
BNE
NXMAR
;NOT LAST OR SECOND LAST
LAMAR
BSET
IBCR,#$08
;SECOND LAST, DISABLE ACK
;TRANSMITTING
BRA
NXMAR
ENMASR
BCLR
IBCR,#$20
;LAST ONE, GENERATE ‘STOP’ SIGNAL
NXMAR
MOVB
IBDR,RXBUF
;READ DATA AND STORE
RTI
RESTART
BSET
IBCR,#$04
;ANOTHER START (RESTART)
MOVB
CALLING,IBDR
;TRANSMIT THE CALLING ADDRESS;D0=R/W