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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： | 59/112頁 |
| 文件大小： | 676K |
| 代理商： | MC68HC705BD3 |
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MC68HC05BD3
MOTOROLA
7-13
M-BUS SERIAL INTERFACE
7
LAMAR
BSET
3,MCR
; LAST SECOND, DISABLE ACK
; TRANSMITTING
BRA
NXMAR
5,MCR
ENMASR BCLR
; LAST ONE, GENERATE 'STOP'
; SIGNAL
; READ DATA AND STORE
NXMAR
LDA
STA
RTI
MDR
RXBUF
7.4.5
Generation of a Repeated START Signal
At the end of data transfer, if the master still wants to communicate on the bus, it can generate
another START signal followed by another slave address without first generating a STOP signal.
A program example is as shown.
RESTART
BCLR
BSET
5,MCR
5,MCR
; ANOTHER START (RESTART) IS
; GENERATED BY THESE TWO
; CONSECUTIVE INSTRUCTIONS
; GET THE CALLING ADDRESS
; TRANSMIT THE CALLING
; ADDRESS
LDA
STA
#CALLING
MDR
7.4.6
Slave Mode
In the slave service routine, the master addressed as slave bit (MAAS) should be tested to check
if a calling of its own address has been received (Figure 7-4). If MAAS is set, software should set
the transmit/receive mode select bit (MTX bit of MCR) according to the R/W command bit (SRW).
Writing to the MCR clears the MAAS automatically. A data transfer may then be initiated by writing
to MDR or a dummy read from MDR.
In the slave transmit routine, the received acknowledge bit (RXAK) must be tested before
transmitting the next byte of data. RXAK, if set indicates the end of data signal from the master
receiver, the slave transmitter must then switch from transmit mode to receive mode by software
and a dummy read must follow to release the SCL line so that the master can generate a STOP
signal.
7.4.7
Arbitration Lost
If more than one master want to acquire the bus simultaneously, only one master can win and the
others will lose arbitration. The losing device immediately switches to slave receive mode by
M-Bus hardware. Its data output to the SDA line is stopped, but internal transmit clock still runs
until the end of the data byte transmission. An interrupt occurs when this dummy byte transmission
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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