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| 型號(hào)： | MC68SC302 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 32-Bit Microprocessor(32位微處理器) |
| 中文描述： | 32位微處理器（32位微處理器） |
| 文件頁(yè)數(shù)： | 85/218頁(yè) |
| 文件大?。?/td> | 521K |
| 代理商： | MC68SC302 |
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Communications Processor (CP)
MOTOROLA
MC68SC302 USER’S MANUAL
4-39
The STOP TRANSMIT command must be issued before the SCC mode register is used
to disable the transmitter if the transmitter is to be re-enabled at a later time.
RESTART TRANSMIT Command
The RESTART TRANSMIT command is used to begin or resume transmission from the
current Tx BD number (TBD#) in the channel's Tx BD table. When this command is re-
ceived by the channel, it will start polling the ready bit in this BD. This command is expect-
ed by the transparent controller after a STOP TRANSMIT command, after a STOP
TRANSMIT command and the disabling of the channel in its mode register, or after a
transmitter error (underrun or CTS lost occurs).
If the transmitter is being re-enabled, the RESTART TRANSMIT command must be used
and should be followed by the enabling of the transmitter in the SCC mode register.
ENTER HUNT MODE Command
After a hardware or software reset and the enabling of the channel in the SCC mode reg-
ister, the channel is in the receive enable mode and will use the first BD in the table.
The ENTER HUNT MODE command is used to force the transparent controller to abort
reception of the current block, generate an RX interrupt (if enabled) as the buffer is closed,
and enter the hunt mode. In the hunt mode, the transparent controller waits for a synchro-
nization to occur on the SCC (see 4.5.11.5 Transparent Synchronization). After receiving
the ENTER HUNT MODE command, the current receive buffer is closed. Reception con-
tinues using the next BD.
If an enabled receiver has been disabled (by clearing ENR in the SCC mode register), the
ENTER HUNT MODE command must be given to the channel before setting ENR again.
INITIALIZE RX Command
This command initializes the Rx parameter RAM, clears the Rx memory chunk and forces
the SCC to enter the hunt mode. This command is expected in initialization before ENR
is set, and when busy interrupt is set.
4.5.11.5 TRANSPARENT SYNCHRONIZATION.
Once the SCC is enabled for transparent
operation in the SCM and the transmit and receive buffer descriptors are made ready for the
SCC, the transmission and reception of data starts.There is no data synchronization while
in transparent mode except when working in non-NMSI with the SI.
With the physical interface configured for IDL or GCI mode, and the DIAG1–DIAG0 bits set
to either software operation or normal operation, the data will be byte-aligned to the B or D
channel time slots.
Once synchronization is achieved for the transmitter, it will remain in effect until an error
occurs, a STOP TRANSMIT command is given, or a buffer has completed transmission with
the TxBD last (L) bit set. Once synchronization is achieved for the receiver, it will remain in
effect until an error occurs or the ENTER HUNT MODE command is given.
4.5.11.6 TRANSPARENT ERROR-HANDLING PROCEDURE.
The transparent controller
reports message reception and transmission error conditions using the channel BDs and the
transparent event register.
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