参数资料
型号: MC68HC05SB7
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: MO-150, SSOP-28
文件页数: 148/170页
文件大小: 2161K
代理商: MC68HC05SB7
August 27, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05SB7
SM-BUS
MOTOROLA
REV 2.1
12-1
SECTION 12
SM-BUS
12.1
SM-BUS INTRODUCTION
The System Management Bus (SM-Bus) is a two wire, bidirectional serial bus
which provides a simple, efcient way for data exchange between devices.
This bus is suitable for applications which need frequent communications over a
short distance between a number of devices. It also provides a exibility that
allows additional devices to be connected to the bus. The maximum data rate is
100kbit/s, and the maximum communication distance and number of devices that
can be connected is limited by a maximum bus capacitance of 400pF.
The SM-Bus is a true multi-master bus, including collision detection and arbitra-
tion to prevent data corruption if two or more masters intend to control the bus
simultaneously. This feature provides the capability for complex applications with
multi-processor control. It may also be used for rapid testing and alignment of end
products via external connections to an assembly-line computer.
Figure 12-1 shows a block diagram of the SM-Bus interface.
12.2
SM-BUS INTERFACE FEATURES
Fully compatible to SM-Bus standard
Multi-master operation
Software programmable for one of 32 different serial clock frequencies
Software selectable acknowledge bit
Interrupt driven byte by byte data transfer
Arbitration lost driven interrupt with automatic mode switching from
master to slave
Calling address identication interrupt
Generate/detect the START or STOP signal
Repeated START signal generation
Generate/recognize the acknowledge bit
Bus busy detection
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