 |
전자부품 데이터시트 검색엔진 |
|
|
전자부품 데이터시트 검색엔진 |
|
68HC705SB7 데이터시트(PDF) 91 Page - Freescale Semiconductor, Inc |
|
|
|||||||||||||||||||||||||||||
68HC705SB7 데이터시트(HTML) 91 Page - Freescale Semiconductor, Inc |
|
|
91 / 170 page  August 27, 1998 GENERAL RELEASE SPECIFICATION MC68HC05SB7 SM-BUS MOTOROLA REV 2.1 12-13 ISR BCLR 1,SMSR ; CLEAR THE SMIF FLAG BRCLR 5,SMCR,SLAVE ; CHECK THE SMSTA FLAG, ; BRANCH IF SLAVE MODE BRCLR 4,SMCR,RECEIVE ; CHECK THE MODE FLAG, ; BRANCH IF IN RECEIVE MODE BRSET 0,SMSR,END ; CHECK ACK FROM RECEIVER ; IF NO ACK, END OF ; TRANSMISSION TRANSMIT LDA DATABUF ; GET THE NEXT BYTE OF DATA STA SMDR ; TRANSMIT THE DATA 12.6.4 Generation of the STOP Signal A data transfer ends with a STOP signal generated by the “master” device. A mas- ter 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 gener- ated by a master transmitter: MASTX BRSET 0,SMSR,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 SMDR ; TRANSMIT THE DATA DEC TXCNT ; DECREASE THE TXCNT BRA EMASTX ; EXIT END BCLR 5,SMCR ; 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 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 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,SMCR ; LAST SECOND, DISABLE ACK ; TRANSMITTING BRA NXMAR ENMASR BCLR 5,SMCR ; LAST ONE, GENERATE “STOP” ; SIGNAL NXMAR LDA SMDR ; READ DATA AND STORE STA RXBUF RTI |
|
링크 URL |
| ALLDATASHEET 가 귀하에 도움이 되셨나요? [ DONATE ] |
Alldatasheet는? | 광고문의 | 운영자에게 연락하기 | 개인정보취급방침 | 링크 투 데이터시트 | 링크교환 | 제조사별 검색 All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Korean ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
