參數(shù)資料
型號(hào): MC68HC705C9A
廠商: Motorola, Inc.
英文描述: Microcontrollers
中文描述: 微控制器
文件頁(yè)數(shù): 91/160頁(yè)
文件大小: 2076K
代理商: MC68HC705C9A
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Serial Communications Interface (SCI)
Idle Line Wakeup
MC68HC705C9A — Rev. 4.0
Advance Information
MOTOROLA
Serial Communications Interface (SCI)
For More Information On This Product,
Go to: www.freescale.com
91
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.
9.9 Idle Line Wakeup
In idle line wakeup mode, a dormant receiver wakes up as soon as the
RDI line becomes idle. Idle is defined as a continuous logic high level on
the RDI line for 10 (or 11) full bit times. Systems using this type of
wakeup must provide at least one character time of idle between
messages to wake up sleeping receivers, but must not allow any idle
time between characters within a message.
9.10 Address Mark Wakeup
In address mark wakeup, the most significant bit (MSB) in a character is
used to indicate whether it is an address (logic 1) or data (logic 0)
character. Sleeping receivers will wake up whenever an address
character is received. Systems using this method for wakeup would set
the MSB of the first character of each message and leave it clear for all
other characters in the message. Idle periods may be present within
messages and no idle time is required between messages for this
wakeup method.
F
Freescale Semiconductor, Inc.
n
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