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參數資料
型號: MC68HC705BD3
廠商: Motorola, Inc.
英文描述: 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述: 8位微控制器單元(MCU)。(8位微控制器)
文件頁數: 57/112頁
文件大小: 676K
代理商: MC68HC705BD3
MC68HC05BD3
MOTOROLA
7-11
M-BUS SERIAL INTERFACE
7
7.4
Programming Considerations
7.4.1
Initialization
Reset will put the M-Bus Control register to its default status. Before the interface can be used to
transfer serial data, the following initialization procedure must be carried out.
1) Update Frequency Divider Register (MFDR) to select an SCL frequency.
2) Update M-Bus Address Register (MADR) to define its own slave address.
3) Set MEN bit of M-Bus Control Register (MCR) to enable the M-Bus interface
system.
4) Modify the bits of M-Bus Control Register (MCR) to select Master/Slave
mode, Transmit/Receive mode, interrupt enable or not.
7.4.2
Generation of a START Signal and
the First Byte of Data Transfer
After completion of the initialization procedure, serial data can be transmitted by selecting the
master transmit mode. If the device is connected to a multi-master bus system, the state of the
M-Bus busy bit (MBB) must be tested to check if the serial bus is free. If the bus is free (MBB=0),
the START condition and the first byte (the slave address) can be sent. An example program which
generates the START signal and transmits the first data byte (slave address) is shown below:
SEI
BRSET
; DISABLE INTERRUPT
CHFLAG
5,MSR,CHFLAG ; CHECK THE MBB BIT OF THE
; STATUS REGISTER. IF IT IS
; SET, WAIT UNTIL IT IS CLEAR
4,MCR
; SET TRANSMIT MODE
5,MCR
; SET MASTER MODE
; i.e. GENERATE START CONDITION
#CALLING
; GET THE CALLING ADDRESS
MDR
; TRANSMIT THE CALLING
; ADDRESS
; ENABLE INTERRUPT
TXSTART
BSET
BSET
LDA
STA
CLI
7.4.3
Software Responses after Transmission or
Reception of a Byte
Upon the completion of the transmission or reception of a data byte, the data transferring bit (MCF)
will be set, indicating one byte communication has been finished. The M-Bus interrupt bit (MIF)
will also be set to generate an M-Bus interrupt if the interrupt is enabled. Software must clear the
TPG
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相關代理商/技術參數
參數描述
MC68HC705BD3P 制造商:Motorola 功能描述:MOTOROLA NXC4C
MC68HC705BD7P1 制造商:Rochester Electronics LLC 功能描述:- Bulk
MC68HC705C4ACP 制造商:Freescale Semiconductor 功能描述:
MC68HC705C8AB 功能描述:IC MCU 8K OTP 2.1MHZ 42-SDIP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:HC05 標準包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN,SCI,SPI 外圍設備:POR,PWM,溫度傳感器,WDT 輸入/輸出數:21 程序存儲器容量:40KB(20K x 16) 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數據轉換器:A/D 6x12b 振蕩器型:內部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323
MC68HC705C8ACB 制造商:Rochester Electronics LLC 功能描述:HCO5 CORE + 8K RAM + EPR - Bulk
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