Datasheet

Chapter 10 Inter-Integrated Circuit (S08IICV2)
MC9S08SG32 Data Sheet, Rev. 8
168 Freescale Semiconductor
10.7 Initialization/Application Information
Figure 10-11. IIC Module Quick Start
Module Initialization (Slave)
1. Write: IICC2
— to enable or disable general call
— to select 10-bit or 7-bit addressing mode
2. Write: IICA
— to set the slave address
3. Write: IICC1
— to enable IIC and interrupts
4. Initialize RAM variables (IICEN = 1 and IICIE = 1) for transmit data
5. Initialize RAM variables used to achieve the routine shown in Figure 10-12
Module Initialization (Master)
1. Write: IICF
— to set the IIC baud rate (example provided in this chapter)
2. Write: IICC1
— 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 10-12
5. Write: IICC1
— to enable TX
6. Write: IICC1
— to enable MST (master mode)
7. Write: IICD
— with the address of the target slave. (The lsb of this byte determines whether the communication is
master receive or transmit.)
Module Use
The routine shown in Figure 10-12 can handle both master and slave IIC operations. For slave operation, an
incoming IIC message that contains the proper address begins 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
IICC1
IICEN IICIE MST
Module configuration
ARBL 0 SRW IICIF RXAK
IICS
TCF IAAS BUSY
Module status flags
Register Model
AD[7:1]
When addressed as a slave (in slave mode), the module responds to this address
MULT
ICR
IICD
DATA
Data register; Write to transmit IIC data read to read IIC data
0 AD10 AD9 AD8
IICC2
GCAEN ADEXT
Address configuration
0
0