mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 292

• Manufacturer Part Number: mc68hc908sr12
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Multi-Master IIC Interface (MMIIC)
17.2 Introduction
Data Sheet
292
17.9.1
17.9.2
17.9.3
17.9.4
17.9.5
17.9.6
17.9.7
17.10 SMBus Protocol Implementation . . . . . . . . . . . . . . . . . . . . . . 316
The multi-master IIC (MMIIC) interface is a two wire, bidirectional serial
bus which provides a simple, efficient way for data exchange between
devices. The interface is designed for internal serial communication
between the MCU and other IIC devices. It has hardware generated
START and STOP signals; and byte by byte interrupt driven software
algorithm.
This bus is suitable for applications which need frequent
communications over a short distance between a number of devices. It
also provides a flexibility that allows additional devices to be connected
to the bus. The maximum data rate is 100k-bps, and the maximum
communication distance and number of devices that can be connected
is limited by a maximum bus capacitance of 400pF.
This MMIIC interface is also SMBus (System Management Bus) version
1.0 and 1.1 compatible, with hardware cyclic redundancy code (CRC)
generation, making it suitable for smart battery applications.
For connection flexibility, two channels are available:
The two channels are multiplexed; only one channel is active at any one
time.
•
•
Channel 0 — SDA0 and SCL0
Channel 1 — SDA1 and SCL1
Quick Command. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313
Send Byte. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313
Receive Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313
Write Byte/Word . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314
Read Byte/Word . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314
Process Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315
Block Read/Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315
Multi-Master IIC Interface (MMIIC)
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
Freescale Semiconductor