MC9S12HY64 Datasheet, PDF (386/792 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

Inter-Integrated Circuit (IICV3) Block Description
Clear
IBIF
Y
Master
N
Mode
?
TX
Tx/Rx
RX
?
Last Byte
Transmitted
Y
?
N
Clear IBAL
Y ^Arbitration
Lost
?
N
RXAK=0
?
N
Y
End Of
Y _{Addr Cycle}
(Master Rx)
?
N
Last
Byte To Be Read _Y
?
N
Y
2nd Last
Byte To Be Read
?
N
Write Next
Byte To IBDR
Set TXAK =1
Generate
Stop Signal
Switch To
Rx Mode
Dummy Read
From IBDR
Generate
Stop Signal
Read Data
From IBDR
And Store
N
IAAS=1
Y Y _IAAS=1
?
?
N
10-bit
address?
N
Y
Data Transfer
Y ^{7-bit address transfer}
(Read)
SRW=1
?
N ^(Write) Y
Set TX
Mode
TX/RX
?
TX
ACK From
Receiver
?
N
RX
10-bit address transfer
N _IBDR==
11110xx1?
Y
set RX
Mode
Write Data
To IBDR
Set RX
Mode
Tx Next
Byte
Read Data
From IBDR
And Store
set TX
Mode
Switch To
Rx Mode
Dummy Read
From IBDR
Write Data
To IBDR
Dummy Read
From IBDR
Dummy Read
From IBDR
RTI
Figure 10-16. Flow-Chart of Typical IIC Interrupt Routine
MC9S12HY/HA-Family Reference Manual, Rev. 1.04
386
Freescale Semiconductor