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參數(shù)資料
| 型號： | CD1865 |
| 廠商： | Intel Corp. |
| 英文描述： | Intelligent Eight-Channel Communications Controller |
| 中文描述： | 智能八通道通信控制器 |
| 文件頁數(shù)： | 70/150頁 |
| 文件大?。?/td> | 871K |
| 代理商： | CD1865 |
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CD1865
—
Intelligent Eight-Channel Communications Controller
70
Datasheet
7.2.4
Special Transmitter Commands
The CD1865 is capable of sending special characters preemptively (bypassing the FIFO): sending
break characters and inserting delays or pauses either between characters or to lengthen a break.
There are two basic mechanisms the CD1865 uses for these
‘
Send Special Character
’
and
‘
Embedded Transmit Command
’
functions.
7.2.5
Special Character Transmission by Send
Special Character Command
Selected special characters, or two-character sequences, may be transmitted preemptively by
setting the appropriate bits in the Channel Command register (CCR). The Send Special Character
(SEND SP CH) bit of the CCR, when set, initiates the Send Special Character Command. SSPC0
–
2 bits of the CCR then specify which character or two-character sequence is used. The choice of a
single- or two-character sequence is determined by the XonCH and XoffCH bits of COR3.
When a Send Special Character Command is given, the CD1865 inserts the special character(s)
into the data stream immediately following the current character in the Transmit Holding register.
Thus, it is ensured that the special character begins transmitting within two-character times after
the command is issued. The Send Special Character Command overrides all other flow-control
modes, including the state of TXEN and CTS*. Generally this is the preferred case. However,
sample CTS* or CD* in some applications to determine if it is okay to send a character before
invoking the Send Special Character Command.
The CCR is reset by the CD1865 as an acknowledgment of the command. A new command must
not be issued if the CCR contents are non-zero. A send special character command is recognized
and cleared within 125
μ
s (at 15 MHz, proportionally longer at lower clock speeds), unless a break
is being sent. If a break is being sent, the special character is not sent until after the break time is
complete.
7.2.6
Embedded Transmit Commands
The CD1865 may be enabled to recognize certain
‘
escape
’
sequences as commands embedded in
the Transmit Data Stream. These commands are issued to introduce a time delay between
characters, to insert an idle period during the transmission, or to send a break on the line.
These capabilities are enabled on a per-channel basis by setting the Embedded Transmit Command
(ETC) bit in the Channel Option register 2 (COR2). The
‘
null
’
(00) character is used as the
controlling character to initiate the special action. To preserve data transparency, two mechanisms
are provided to allow the null character to be sent as data. If the host must transmit a null character
as data, either the ETC mode may be disabled, or the null character may be preceded by a null, that
is,
‘
00 00
’
causes one-null character to be sent. If the ETC bit is not set, the
‘
00
’
character has no
effect, and it may be sent as ordinary data. ETC mode may be enabled or disabled
‘
on-the-fly
’
.
The CD1865 uses the Transmit Timer to generate time delays between characters in the output data
stream. It is also used to extend the duration of a line-break transmit condition when the delay is
inserted between the
‘
Start Break
’
and
‘
Stop Break
’
embedded-transmit commands. All of the
timers count ticks are determined by the Prescaler Counter. The two eight-bit Prescaler Period
registers (PPRH and PPRL) determine the real-time length of a tick. A tick is the period of the
CD1865 System Clock Input (CLK) multiplied by the Period registers
’
contents.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| CD1865N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| CD1865P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| CD1866N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| CD1866P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| CD1867N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
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