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68HC705SB7 bảng dữ liệu(PDF) 87 Page - Freescale Semiconductor, Inc |
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68HC705SB7 bảng dữ liệu(HTML) 87 Page - Freescale Semiconductor, Inc |
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87 / 170 page ![]() August 27, 1998 GENERAL RELEASE SPECIFICATION MC68HC05SB7 SM-BUS MOTOROLA REV 2.1 12-9 SRW — Slave Read/Write Select When SMAAS is set, the R/W command bit of the calling address sent from master is latched into the R/W command bit (SRW). By checking this bit, the CPU can select slave transmit/receive mode according to the command of master. 1 = Read from slave, from calling master. 0 = Write to slave from calling master. SMIF — SM-Bus Interrupt Flag 1 = An SM-Bus interrupt has occurred. 0 = An SM-Bus interrupt has not occurred. This bit is set when one of the following events occur: – Transmission (either transmit or receive mode) of one byte completed. The bit is set at the falling edge of the 9th clock. – Receive a calling address which matches its own specific address in slave receive mode. – Arbitration lost. RXAK — Receive Acknowledge When this bit is “0”, it indicates an acknowledge signal has been received after the completion of 8 bits data transmission on the bus. If RXAK is “1”, it means no acknowledge signal is detected at the 9th clock. This bit is set upon reset. 1 = No acknowledgment signal detected. 0 = Acknowledgment signal detected after 8 bits data transmitted. |
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