參數(shù)資料
型號(hào)： MC68HC2681FN
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 2 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁數(shù)： 43/88頁
文件大?。?/td> 726K
代理商： MC68HC2681FN
Programming and Register Descriptions
4-18
MC68HC681 USER’S MANUAL
MOTOROLA
4
4.3.7.3 CHANNEL A TRANSMITTER COMMANDS - CRA[3:2]. The encoded value of
this field specifies a single command for the transmitter as follows:
4.3.7.4 CHANNEL A RECEIVER COMMANDS - CRA[1:0]. The encoded value of this
field specifies a single command for the receiver as follows:
1 0 1
Reset Channel A Break Change Interrupt. This command causes the channel A break detect change bit in the interrupt status
register (ISR[2]) to be cleared to zero.
1 1 0
Start Break. This command forces the channel A transmitter serial-data output (TxDA) low (spacing). If the transmitter is empty,
the start of the break condition will be delayed up to two bit times. If the transmitter is active, the break begins when
transmission of the character is completed. If a character is in the transmit holding register, the start of the break will be delayed
until that character
1 1 1
Stop Break. The channel A transmitter serial-data output (TxDA) line will go high (marking) within two bit times. TxDA will remain
high for one bit time before the next character, if any, is transmitted.
NOTE:
The error bits must actually be cleared before reading the last character of the block, unless it can be guaranteed that
no more characters are in the FIFO after the last character of the current block.
CRA[3:2]
COMMAND
0 0
No action is taken. The transmitter stays in its present mode. If the transmitter was enabled it remains enabled, if disabled it
remains disabled.
0 1
Enable Transmitter. This command enables operation of the channel A transmitter.
1 0
Disable Transmitter. This command terminates transmitter operation and resets the transmitter-ready and transmitter-empty
status bits. However, if a character is being transmitted when the transmitter is disabled, the transmission of the character is
completed before assuming the inactive state.
1 1
Illegal command; do not use.
CRA[1:0]
COMMAND
0 0
No action is taken. The receiver stays in its present mode. If the receiver was enabled it remains enabled, if disabled it remains
disabled.
0 1
Enable Receiver. This command enables operation of the channel A receiver. If the DUART is not in the multidrop mode, this
command also forces the receiver into the search-for-start-bit state.
1 0
Disable Receiver. This command terminates operation of the receiver immediately - a character being received, or waiting in the
shift register for an opening in the receive FIFO, will be lost. The command has no effect on the receiver status bits or any other
control register. If the DUART has been programmed to operate in the local loopback or multidrop mode, the receiver operates
even if it is disabled. Refer to Section 3 Operation for further information.
1 1
Illegal command; do not use.
CRA[6:4]
COMMAND
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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