
I
2
C Interface
32-2
Freescale Semiconductor
32.1.2
Overview
I
2
C is a two-wire, bidirectional serial bus that provides a simple, efficient method of data exchange,
minimizing the interconnection between devices. This bus is suitable for applications that require
occasional communication between many devices over a short distance. The flexible I
2
C bus allows
additional devices to connect to the bus for expansion and system development.
The interface operates up to 100 Kbps with maximum bus loading and timing. The device is capable of
operating at higher baud rates, up to a maximum of the internal bus clock divided by 20, with reduced bus
loading. The maximum communication length and the number of devices connected are limited by a
maximum bus capacitance of 400 pF.
The I
2
C system is a true multiple-master bus; it uses arbitration and collision detection to prevent data
corruption in the event that multiple devices attempt to control the bus simultaneously. This feature
supports complex applications with multiprocessor control and can be used for rapid testing and alignment
of end products through external connections to an assembly-line computer.
NOTE
The I
2
C module is compatible with the Philips I
2
C bus protocol. For
information on system configuration, protocol, and restrictions, see
The I
2
C
Bus Specification, Version 2.1
.
NOTE
The GPIO module must be configured to enable the peripheral function of
the appropriate pins (refer to
Chapter 13, “General Purpose I/O Module”
)
prior to configuring the I
2
C module.
32.1.3
Features
The I
2
C module has these key features:
•
Compatibility with I
2
C bus standard version 2.1
•
Support for 3.3-V tolerant devices
•
Multiple-master operation
•
Software-programmable for one of 50 different 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
•
Repeated START signal generation
•
Acknowledge bit generation/detection
•
Bus-busy detection
MCF5329 Reference Manual, Rev 3
Summary of Contents for MCF5329
Page 106: ...ColdFire Core 3 32 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 148: ...Cache 5 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 154: ...Static RAM SRAM 6 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 184: ...Power Management 8 18 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 204: ...Reset Controller Module 10 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 220: ...System Control Module SCM 11 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 228: ...Crossbar Switch XBS 12 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 268: ...General Purpose I O Module 13 40 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 392: ...SDRAM Controller SDRAMC 18 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 436: ...Fast Ethernet Controller FEC 19 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 594: ...FlexCAN 23 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 678: ...Pulse Width Modulation PWM Module 26 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 684: ...Watchdog Timer Module 27 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 704: ...DMA Timers DTIM0 DTIM3 29 12 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 754: ...UART Modules 31 34 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 770: ...I2 C Interface 32 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 866: ...Debug Module 36 50 Freescale Semiconductor MCF5329 Reference Manual Rev 3...