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: 150/170页
文件大小: 2161K
代理商: MC68HC05SB7
GENERAL RELEASE SPECIFICATION
August 27, 1998
MOTOROLA
SM-BUS
MC68HC05SB7
12-2
REV 2.1
Figure 12-1. SM-Bus Interface Block Diagram
12.3
SM-BUS SYSTEM CONFIGURATION
The SM-Bus system uses a serial data line (SDA) and a serial clock line (SCL) for
data transfer. All devices connected to it must have open drain or open collector
outputs and the logical “AND” function is performed on both lines by two pull up
resistors.
12.4
SM-BUS PROTOCOL
Normally a standard communication is composed of four parts, START signal,
Slave Address transmission, Data transfer, and STOP signal. These are described
briey in the following sections and illustrated in Figure 12-2.
Internal bus
Frequency
divider
register
Address
comparator
Address
register
8
SMEN SMIEN SMSTA SMTX TXAK
SMCF SMAAS SMBB SMAL
SRW
SMIF SRXAK
TX shift
register
RX shift
register
RX
control
TX
control
M-Bus
interrupt
SCL
control
SDA
control
M-Bus clock
generator
sync logic
START, STOP
detector and
arbitration
START, STOP
generator and
timing sync
SCL
SDA
Control register
Status register
Interrupt
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