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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HC705C9AGRS/D датащи(PDF) 85 Page - NXP Semiconductors |
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HC705C9AGRS/D датащи(HTML) 85 Page - NXP Semiconductors |
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85 / 157 page  General Release Specification Receiver Wakeup Operation MC68HC705C9A — Rev. 2.0 Serial Communications Interface (SCI) 9.8 Receiver Wakeup Operation The receiver logic hardware also supports a receiver wakeup function which is intended for systems having more than one receiver. With this function a transmitting device directs messages to an individual receiver or group of receivers by passing addressing information as the initial byte(s) of each message. The wakeup function allows receivers not addressed to remain in a dormant state for the remainder of the unwanted message. This eliminates any further software overhead to service the remaining characters of the unwanted message and thus improves system performance. The receiver is placed in wakeup mode by setting the receiver wakeup bit (RWU) in the SCCR2 register. While RWU is set, all of the receiver-related status flags (RDRF, IDLE, OR, NF, and FE) are inhibited (cannot become set). NOTE: The idle line detect function is inhibited while the RWU bit is set. Although RWU may be cleared by a software write to SCCR2, it would be unusual to do so. Normally, RWU is set by software and is cleared automatically in hardware by one of these methods: idle line wakeup or address mark wakeup. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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