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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: 58/112頁
文件大小: 676K
代理商: MC68HC705BD3
MOTOROLA
7-12
MC68HC05BD3
M-BUS SERIAL INTERFACE
7
MIF bit in the interrupt routine first. The MCF bit can be cleared by reading the M-Bus Data I/O
Register (MDR) in receive mode or writing to the MDR in transmit mode. Software may serve the
M-Bus I/O in the main program by monitoring the MIF bit if the interrupt is disabled. The following
is an example of a software response by a master in transmit mode in the interrupt routine (see
Figure 7-4).
ISR
BCLR
BRCLR
1,MSR
5,MCR,SLAVE
; CLEAR THE MIF FLAG
; CHECK THE MSTA FLAG,
; BRANCH IF SLAVE MODE
BRCLR
4,MCR,RECEIVE ; CHECK THE MODE FLAG,
; BRANCH IF IN RECEIVE MODE
0,MSR,END
; CHECK ACK FROM RECEIVER
; IF NO ACK, END OF
; TRANSMISSION
DATABUF
; GET THE NEXT BYTE OF DATA
MDR
; TRANSMIT THE DATA
BRSET
TRANSMIT
LDA
STA
7.4.4
Generation of the STOP Signal
A data transfer ends with a STOP signal generated by the master device. A master in transmit
mode can simply generate a STOP signal after all the data have been transmitted. The following
is an example showing how a STOP condition is generated by a master in transmit mode.
MASTX
BRSET
LDA
0,MSR,END
TXCNT
; IF NO ACK, BRANCH TO END
; GET VALUE FROM THE
; TRANSMITTING COUNTER
; IF NO MORE DATA, BRANCH TO
; END
; GET NEXT BYTE OF DATA
; TRANSMIT THE DATA
; DECREASE THE TXCNT
; EXIT
; GENERATE A STOP CONDITION
; RETURN FROM INTERRUPT
BEQ
END
LDA
STA
DEC
BRA
BCLR
DATABUF
MDR
TXCNT
EMASTX
5,MCR
END
EMASTX RTI
If a master receiver wants to terminate a data transfer, it must inform the slave transmitter by not
acknowledging the last byte of data. This can be achieved by setting the transmit acknowledge bit
(TXAK) before reading the 2nd last byte of data. Before reading the last byte of data, a STOP
signal must be generated first. The following is an example showing how a STOP signal is
generated by a master in receive mode.
MASR
DEC
BEQ
LDA
DECA
BNE
RXCNT
ENMASR
RXCNT
; LAST BYTE TO BE READ
; CHECK LAST 2ND BYTE TO BE READ
; NOT LAST ONE OR LAST SECOND
NXMAR
TPG
相關PDF資料
PDF描述
MC68HC05C4 8-Bit Microcontroller Units (MCU).(8位微控制器)
MC68HC05C5 8-Bit Microcontroller Units (MCU).(8位微控制器)
MC68HC05C8A Microcontrollers
MC68HC05C9A 8-Bit Microcontroller(8位微控制器)
MC68HCL05C9A 8-Bit Microcontroller(8位微控制器)
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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