Datasheet

Chapter 13 Inter-Integrated Circuit (S08IICV1)
MC9S08AW60 Data Sheet, Rev 2
230 Freescale Semiconductor
13.7 Initialization/Application Information
Figure 13-10. IIC Module Quick Start
Module Initialization (Slave)
1. Write: IICA
— to set the slave address
2. Write: IICC
— to enable IIC and interrupts
3. Initialize RAM variables (IICEN = 1 and IICIE = 1) for transmit data
4. Initialize RAM variables used to achieve the routine shown in Figure 13-11
Module Initialization (Master)
1. Write: IICF
— to set the IIC baud rate (example provided in this chapter)
2. Write: IICC
— to enable IIC and interrupts
3. Initialize RAM variables (IICEN = 1 and IICIE = 1) for transmit data
4. Initialize RAM variables used to achieve the routine shown in Figure 13-11
5. Write: IICC
— to enable TX
6. Write: IICC
— to enable MST (master mode)
7. Write: IICD
— with the address of the target slave. (The LSB of this byte will determine whether the communication is
master receive or transmit.)
Module Use
The routine shown in Figure 13-11 can handle both master and slave IIC operations. For slave operation, an
incoming IIC message that contains the proper address will begin IIC communication. For master operation,
communication must be initiated by writing to the IICD register.
0
IICF
IICA
Baud rate = BUSCLK / (2 x MULT x (SCL DIVIDER))
TX TXAK RSTA 0 0
IICC
IICEN IICIE MST
Module configuration
ARBL 0 SRW IICIF RXAK
IICS
TCF IAAS BUSY
Module status flags
Register Model
ADDR
Address to which the module will respond when addressed as a slave (in slave mode)
MULT
ICR
IICD
DATA
Data register; Write to transmit IIC data read to read IIC data