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HC705E5GRS/D Datasheet(PDF) 91 Page - NXP Semiconductors |
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HC705E5GRS/D Datasheet(HTML) 91 Page - NXP Semiconductors |
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91 / 148 page  Motorola Bus (M Bus) Interface Programming Considerations MC68HC705E5 — Rev. 1.0 General Release Specification Motorola Bus (M Bus) Interface 11.8.4 Generation of the Stop Signal A data transfer ends with a stop signal generated by the master device. A master transmitter can simply generate a stop signal after all the data has been transmitted. The following is an example showing how a stop condition is generated by a master transmitter. MASTX BRSET 0,MSR,END ; IF NO ACK, BRANCH TO END LDA TXCNT ; GET VALUE FROM THE ; TRANSMITTING COUNTER BEQ END ; IF NO MORE DATA, BRANCH TO ; END LDA DATABUF ; GET NEXT BYTE OF DATA STA MDR ; TRANSMIT THE DATA DEC TXCNT ; DECREASE THE TXCNT BRA EMASTX ; EXIT END BCLR 5,MCR ; GENERATE A STOP CONDITION EMASTX RTI ; RETURN FROM INTERRUPT 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 done by setting the transmit acknowledge bit (TXAK) before reading the second to the 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 receiver. MASR DEC RXCNT BEQ ENMASR ; LAST BYTE TO BE READ LDA RXCNT DECA ; CHECK LAST 2ND BYTE TO BE READ BNE NXMAR ; NOT LAST ONE OR LAST SECOND LAMAR BSET 3,MCR ; LAST SECOND, DISABLE ACK ; TRANSMITTING BRA NXMAR ENMASR BCLR 5,MCR ; LAST ONE, GENERATE 'STOP' ; SIGNAL NXMAR LDA MDR ; READ DATA AND STORE STA RXBUF RTI Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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