PXN20RM Datasheet, PDF (1047/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

Address
DMA request
Inter-Integrated Circuit Bus Controller Module (I²C)
IRQ
Data bus
ADDR_DECODE
DATA_MUX
CTRL_REG FREQ_REG ADDR_REG STATUS_REG DATA_REG
Input
Sync
Clock
Control
Start
Stop
Arbitration
Control
In/Out
Data
Shift
Register
Address
Compare
SCL SDA
Figure 32-2. I²C Module DMA Interface Block Diagram
32.1.3 Features
The I²C has these major features:
• Compatible with I²C bus standard
• Multi-master operation
• Software programmable for one of 256 serial clock frequencies
• Software selectable acknowledge bit
• Interrupt driven byte-by-byte data transfer
• Arbitration lost interrupt with automatic mode switching from master to slave
• Calling address identification interrupt
• Start and stop signal generation/detection
Freescale Semiconductor
PXN20 Microcontroller Reference Manual, Rev. 1
32-3