參數(shù)資料
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): 87/218頁(yè)
文件大小: 521K
代理商: MC68SC302
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Communications Processor (CP)
MOTOROLA
MC68SC302 USER’S MANUAL
4-41
of this BD when this bit is set. The empty bit will remain set while the CP is currently
filling the buffer with received data.
OV—Overrun
A receiver overrun occurred during reception.
DATA LENGTH
The data length is the number of octets that the CP has written into this BD's data buffer.
It is written only once by the CP as the buffer is closed.
4.5.11.8 TRANSPARENT TRANSMIT BUFFER DESCRIPTOR (TXBD).
Data is
presented to the CP for transmission on an SCC channel by arranging it in buffers
referenced by the channel's TxBD table. The CP confirms transmission (or indicates error
conditions) using the BD to inform the processor that the buffers have been serviced. The
TxBD is shown in Figure 4-14.
Figure 4-14. Transparent Transmit Buffer Descriptor
The first word of the TxBD contains the data length, and status and control bits. These bits
are prepared by the user before transmission and are set by the CP after the buffer has been
transmitted.
R—Ready
0 = This buffer is not currently ready for transmission. The user is free to manipulate
this BD (or its associated buffer). The CP clears this bit after the buffer has been
fully transmitted or after an error condition has been encountered.
1 = The data buffer has been prepared for transmission by the user (but not yet
transmitted). No fields of this BD may be written by the user once this bit is set.
W—Wrap (Final BD in TxBD Table)
0 = This is not the last BD in the TxBD table.
1 = This is the last BD in the TxBD table. After this buffer has been used, the CP will
transmit data from the first BD in the table.
I—Interrupt
0 = No interrupt is generated after this buffer has been serviced.
1 = When this buffer is serviced by the CP, the TX or TXE bit in the transparent event
register will be set, which can cause an interrupt.
L—Last in Message
0 = The last byte in the buffer is not the last byte in the transmitted block. Data from the
next transmit buffer (if ready) will be transmitted immediately following the last byte
of this buffer.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
OFFSET + 0
R
-
W
I
L
TC
UN
COL
DATA LENGTH
OFFSET + 2
TX BUFFER POINTER
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