参数资料
型号: MC68HC705BS8FB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.2 MHz, MICROCONTROLLER, PQFP44
封装: PLASTIC, QFP-44
文件页数: 88/128页
文件大小: 9691K
代理商: MC68HC705BS8FB
8-2
MC68HC05BS8
M-BUS SERIAL INTERFACE
8
8.2
M-Bus Protocol
Normally, a standard communication is composed of four parts,
1) START signal,
2) slave address transmission,
3) data transfer, and
4) STOP signal.
They are described briey in the following sections and illustrated in Figure 8-2.
Figure 8-1 M-Bus Interface Block Diagram
Internal bus
Frequency
divider
register
Address
comparator
Address
register
8
MEN MIEN MSTA MTX TXAK
MCF MAAS MBB
MAL
SRW
MIF
RXAK
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
TPG
60
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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