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| 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） |
| 文件頁數(shù)： | 38/50頁 |
| 文件大小： | 6613K |
| 代理商： | MC68QH302 |
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MOTOROLA
MC68QH302 Supplement to the MC68302 Users Manual
29
2.12 QH-Mode SCC1 Event Register (SCCE1)
In QH mode, the SCC1 event register (SCCE1) reports events occurring in both B channels.
When SCCE1 reports an event, the user must check each B channels Rx/Tx status registers
B_STAT1/2 to determine which B channel reported. Figure 25 shows SCCE1.
Figure 25. SCCE1 Register
Each bit of the event register can generate an interrupt maskable by the SCC mask register
(SCCM). SCCE1[7D5] should always be masked for the B channels. Table 28 describes the
SCCE1 Telds.
7
6
5
4
3
2
1
0
—
—
—
TXE
RXF
RXE
TXB
RXB
Table 28. SCCE1 Field Descriptions
Bits
Name
Description
7–5
—
Should be masked in the SCC1 mask register; their value is undefined in QH mode.
4
TXE
Tx error. An underrun error has occurred. Once detected, the B channel ends buffer
transmission and sends an abort sequence. The transmitter sets B_STAT2[BUN] and sets
SCCE1[TXE]. Note that the BUN bit can be set in both channels.
Upon a TXE event, the host should read each B channels’ B_STAT2[BUN] to determine
which channel(s) underran. For each B channel whose BUN bit is set, the host should issue
STOP
TX
, initialize the transmit parameters (see Section 2.14, “QH Parameters Initialization
Summary”), and then issue
RESTART
TX
to restart the B channe(s)l.
3
RXF
Rx frame. A RXF event indicates a complete frame has been received in one or both B
channels. Host must check each BD table to determine which channel(s) has a new frame.
2
RXE
Rx error. A RXE event indicates a busy condition or an overrun has been detected by one
or both B channels. The receiver stops and sets the channel’s B_STAT1[BOV].
Upon a RXE event, the host should read each B channels’ B_STAT1[BOV] to determine
which channel(s) are reported. For each B channel whose BOV bit is set, the host should
issue
STOP
RX
, initialize the receive parameters (see Section 2.14, “QH Parameters
Initialization Summary”), and then issue
RESTART
RX
to restart the channel.
1
TXB
Tx buffer. A TXB event indicates a buffer has been sent in either B1 or in B2. When
enabled, the TXB interrupt is generated when the last data of the buffer is written to the
FIFO, but not yet sent. This is opposite to the 302 behavior for the last buffer in a frame.
0
RXB
Rx buffer. An RXB event indicates that a buffer has been received either in B1 or in B2.
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