參數(shù)資料
型號(hào)： MC68QH302
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)： 28/50頁(yè)
文件大?。?/td> 6613K
代理商： MC68QH302
MOTOROLA
MC68QH302 Supplement to the MC68302 Users Manual
19
2.6.7 B_STAT2B-Channel Transmitter Status
B_STAT2 contains B-channel transmitter status bits and internal-use bits. After reset, the
user must clear this byte for both B channels. After this initial clearing, however, the user
should access this byte using host commands only; see Section 2.13.1, òB-Channel Host
Commands,ó for more information on how host commands affect B-channel status bits.
Figure 12 shows the Telds and Table 20 describes them.
Figure 12. B_STAT2 Byte
2.6.7.1 B-Channel-Underrun and B-Channel-Transmitter-Valid Flags
B_STAT2[BUN] reports underrun errors and B_STAT2[BTV] reects the channels
activation status.
When the host does not prepare the necessary data for the complete transmission of the
current frame, the RISC controller underruns. The controller then sets B_STAT2[BUN],
disabling the underrunning B channels transmitter, and signals the host with a transmitter
error (TXE) interrupt. An abort sequence followed by idle characters (high voltage) will be
automatically sent.
The user must determine which B channel has underrun by polling both B channels
B_STAT2[BUN] and then issue
STOP
TX
for that channel.
STOP
TX
clears B_STAT2[BUN].
Note that both B channels could underrun simultaneously as in the case of a hardware
underrun.
It is the user's responsibility to re-initialize the channel parameters and then issue
RESTART TX
, reactivating the channel.
RESTART
TX
clears B_STAT1[BUN] and sets
B_STAT1[BTV].
7
6
5
4
3
2
1
0
0
BUN
0
BTV
0
0
0
0
Table 20. B_STAT2 Field Descriptions
Bit(s)
Name
Description
7
—
For internal use—must be initialized to zero
6
BUN
B channel transmitter underrun—must be initialized to zero
0 No underrun error
1 Underrun error
5
—
For internal use—must be initialized to zero
4
BTV
B channel transmitter valid—must be initialized to zero
0 B channel transmitter disabled
1 B channel transmitter enabled
3–0
—
For internal use—must be initialized to zero
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