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參數(shù)資料
| 型號(hào)： | ST16C452PS |
| 廠商： | Exar Corporation |
| 英文描述： | Dual UART with Parallel Printer Port(雙通用異步接收器/發(fā)送器（帶并行打印機(jī)端口）) |
| 中文描述： | 雙UART與并行打印機(jī)端口（雙通用異步接收器/發(fā)送器（帶并行打印機(jī)端口）） |
| 文件頁數(shù)： | 12/30頁 |
| 文件大?。?/td> | 389K |
| 代理商： | ST16C452PS |
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12
ST16C452/452PS
Rev. 3.10
or output functions. The signals have internal pull-up
resistors and can be wire-ord. Normally, -STROBE is
used to strobe PD0-PD7 bus data into a printer input
buffer. -SLCTIN normally selects the printer while
AutoFDXT signals the printer to auto-linefeed. Other
signals provide similar printer functions but are not bi-
directional. The printer functions for these signals are
described in table 1, Symbol Description.
The interface provides a mode steering signal called
BIDEN. BIDEN controls the bi-directional 8-bit data
bus (PD0-PD7) direction, input or output. When
BIDEN is a logic 1 a single control bit (D5) in the control
register sets the input or output mode. Setting BIDEN
to a logic 0 however sets an IBM interface compatible
mode. In this mode the bus direction (input/output) is
set by eight data bits in the IOSEL register. An AA
(Hex) pattern sets the input mode while a 55 (hex)
pattern sets the output mode. I/O direction is depicted
in Table 6 below.
Printer Port
The 452/452PS contains a general purpose 8-bit
parallel interface port that is designed to directly
interface with a CENTRONICS Printer. A number of
the control/interrupt signals and the 8-bit data bus
have been designed as bi-directional data buses. This
allows the interface to function with other device
parallel data bus applications. Signal -ACK is used to
generate an -INTP interface interrupt that would nor-
mally be connected to the user CPU. -INTP can be
made to follow the -ACK signal, normal mode (see
Figure 7) or it can be configured for the latch mode. In
the latch mode the interrupt is not cleared until printer
status register (SR) is read. Another signal (INIT) can
be made to function as an outgoing or incoming
interrupt, or combined with other interrupts to provide
a common wire-or interrupt output. Interface signals -
STROBE, -AutoFDXT, and -SLCTIN are bi-direc-
tional and can be used as combinations of input and/
Table 6, PD0-PD7 I/O DIRECTION MODE SELECTION
PORT DIRECTION
BIDEN
CONTROL REGISTER (D5)
I/O SELECT REGISTER
Input mode
Output mode
Output mode
Input mode
0
0
1
1
X
(Note 4)
X
(Note 4)
0
1
AA Hex
55 Hex
X
(Note 4)
X
(Note 4)
Note: 4 = dont care
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST16C452 | Dual UART with Parallel Printer Port(雙通用異步接收器/發(fā)送器（帶并行打印機(jī)端口）) |
| ST16C550 | UART with 16-Byte FIFO(通用異步接收器/發(fā)送器（帶16字節(jié)的先進(jìn)先出）) |
| ST16C552 | Dual UART with 16-Byte FIFO and Parallel Printer Port(雙通用異步接收器/發(fā)送器（帶16字節(jié)的先進(jìn)先出和并行打印機(jī)端口）) |
| ST16C552A | Dual UART with 16-Byte FIFO and Parallel Printer Port(雙通用異步接收器/發(fā)送器（帶16字節(jié)的先進(jìn)先出和并行打印機(jī)端口）) |
| ST16C554DCJ68 | QUAD UART WITH 16-BYTE FIFOS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST16C454 | 制造商:EXAR 制造商全稱:EXAR 功能描述:QUAD UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER (UART) |
| ST16C454_05 | 制造商:EXAR 制造商全稱:EXAR 功能描述:QUAD UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER (UART) |
| ST16C454CJ | 制造商:Exar Corporation 功能描述: |
| ST16C454CJ-0A-EVB | 功能描述:界面開發(fā)工具 Supports C454 68 ld PLCC, ISA Interface RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評(píng)估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| ST16C454CJ68 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
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