參數(shù)資料
型號(hào)： XR16C872
廠商： Exar Corporation
英文描述： Dual UART with 1284 Parallel Port and Plug-and-Play（PnP） Controller(雙通用異步接收器/發(fā)送器（帶1284雙向并行端口和即插即用控制器）)
中文描述： 雙UART）與1284并行端口，插頭插即用（PnP）功能控制器（雙通用異步接收器/發(fā)送器（帶1284雙向并行端口和即插即用控制器）
文件頁(yè)數(shù)： 7/60頁(yè)
文件大?。?/td> 314K
代理商： XR16C872
XR16C872
7
Rev. P1.00
Preliminary
Symbol
Pin #
Type
Pin Description
PDIR
31
O
Parallel Port Direction Indicator. PDIR indicates the operating direction of the
parallel port. An output logic 0 indicates the parallel port is operating as an
output port and a logic 1 indicates it is an input port.
BUSY
50
IP24
BUSY is an active high printer busy indicator or general purpose input.
Generally, it is used as an input from the printer and a logic 1 indicates it is not
ready. The input has an internal weak pull-up resistor.
ERR#
52
IP24
ERR# is printer error indicator or a general purpose input. Generally, it is
used as an input from the printer and a logic 0 indicates it has an error
condition. The input has a weak internal pull-up resistor.
INIT#
45
IOP14
INIT# is a printer initialization signal or a general purpose output. Generally, it
is used with the printer (active low) for system initialization or reset. The pin is
a tri-state output and has an internal weak pull-up resistor.
PE
49
IP24
PE is a signal from the printer indicating a paper empty condition or general
purpose input. Generally, it is used with a printer and a logic 1 indicates the
printer is out of paper. This input has an internal weak pull-up resistor.
SELECT
48
IP24
SELECT is the printer select status indicator to the host or general purpose
input. Normally this pin is connected to a printer output and a logic 0 indicates
the ready status of the printer, i.e., on-line and/or on-line and ready condiftion.
This pin has an internal weak pull-up resistor.
SELCTIN#
44
IOP14
SELCTIN# is a select signal to the printer or general purpose I/O pin. This pin
can be read via bit-3 in the printer command register, or written via bit-3 in the
printer control register. Normally this signal is connected to a printer to select
the printer with an active low signal. The pin is tri-state output and has an
internal weak pull-up resistor.
STROBE#
47
IOP14
STROBE# is a data strobe output or general purpose I/O pin. Normally this
output is connected to a printer and indicates that valid data is available on
the data bus (PD0-PD7). The pin is a tri-state output with an intenal weak
pull-up resistor.
MODEM OR SERIAL PORT INTERFACE
RXA, RXB
63,53
I
Receive Data A/B. Serial receive data or IR pulses input to UART channel A
and B. The RX signal to the UART should be a logic 1 state during reset, idle
(no data) and sleep mode. During the local loop-back mode, the RX input pins
are disabled and TX data is internally connected to the UART RX Inputs. In the
IR mode, this input is normally at logic 0.
TXA, TXB
64,54
O
Transmit Data A/B. Serial transmit data or IR pulses output from channel A
and B. The normal output is a logic 1 for serial data during reset, idle (no
data), sleep mode, or when the transmitter is disabled. During the local loop-
back mode, the TX output pin is held at logic 1and internally it connects to RX
input. In IR mode, the output changes to a logic 0 after it is enabled (MCR
bit 5=1).
PIN DESCRIPTION (CONT'D)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR16C872CQ 制造商:EXAR 制造商全稱:EXAR 功能描述:DUAL UART WITH 1284 PARALLEL PORT AND PLUG-AND-PLAY CONTROLLER
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XR16L2450IJ 制造商:EXAR 制造商全稱:EXAR 功能描述:2.25V TO 5.5V DUART
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