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| 型號(hào)： | MC68HSC05C9A |
| 廠(chǎng)商： | Motorola, Inc. |
| 元件分類(lèi)： | 8位微控制器 |
| 英文描述： | 8-Bit Microcontroller(8位微控制器) |
| 中文描述： | 8位微控制器（8位微控制器） |
| 文件頁(yè)數(shù)： | 75/160頁(yè) |
| 文件大小： | 783K |
| 代理商： | MC68HSC05C9A |
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Serial Communications Interface (SCI)
Receiver Wakeup Operation
MC68HC05C9A
—
Rev. 4.0
General Release Specification
MOTOROLA
Serial Communications Interface (SCI)
75
L
G
R
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.
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