參數(shù)資料
型號： MC68HC705C9A
廠商： Motorola, Inc.
英文描述： Microcontrollers
中文描述： 微控制器
文件頁數(shù)： 89/160頁
文件大?。?/td> 2076K
代理商： MC68HC705C9A
Serial Communications Interface (SCI)
Functional Description
MC68HC705C9A — Rev. 4.0
Advance Information
MOTOROLA
Serial Communications Interface (SCI)
For More Information On This Product,
Go to: www.freescale.com
89
register is synchronized with the bit rate clock (see
Figure 9-2
). All data
is transmitted least significant bit first. Upon completion of data
transmission, the transmission complete flag (TC) in the SCSR is set
(provided no pending data, preamble, or break is to be sent) and an
interrupt is generated (if the transmit complete interrupt is enabled). If
the transmitter is disabled, and the data, preamble, or break (in the
transmit data shift register) has been sent, the TC bit will be set also.
This will also generate an interrupt if the transmission complete interrupt
enable bit (TCIE) is set. If the transmitter is disabled during a
transmission, the character being transmitted will be completed before
the transmitter gives up control of the TDO pin.
When SCDR is read, it contains the last data byte received, provided that
the receiver is enabled. The receive data register full flag bit (RDRF) in
the SCSR is set to indicate that a data byte has been transferred from
the input serial shift register to the SCDR; this will cause an interrupt if
the receiver interrupt is enabled. The data transfer from the input serial
shift register to the SCDR is synchronized by the receiver bit rate clock.
The OR (overrun), NF (noise), or FE (framing) error flags in the SCSR
may be set if data reception errors occurred.
An idle line interrupt is generated if the idle line interrupt is enabled and
the IDLE bit (which detects idle line transmission) in SCSR is set. This
allows a receiver that is not in the wakeup mode to detect the end of a
message, or the preamble of a new message, or to re-synchronize with
the transmitter. A valid character must be received before the idle line
condition or the IDLE bit will not be set and idle line interrupt will not be
generated.
Figure 9-2. Rate Generator Division
OSC FREQ
(f
OSC
)
3
÷
2
BUS FREQ
(f
OP
)
SCP0
–
SCP1
SCI PRESCALER
SELECT
CONTROL
N
SCR0
–
SCR2
SCI RATE
SELECT
CONTROL
M
÷
16
SCI TRANS
CLOCK (TX)
SCI RECEIVE
CLOCK (RT)
F
Freescale Semiconductor, Inc.
n
.
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