參數(shù)資料
型號(hào)： a16450
廠商： Altera Corporation
英文描述： Universal Asynchronous Receiver/Transmitter(通用異步接收/傳送器)
中文描述： 通用異步接收器/發(fā)送器（通用異步接收/傳送器）
文件頁(yè)數(shù)： 3/16頁(yè)
文件大小： 281K
代理商： A16450
Altera Corporation
67
a16450 Universal Asynchronous Receiver/Transmitter Data Sheet
sin
Input
Input
–
Serial data input. Receives data for the
Write control. When
write transactions to internal registers are possible.
Write control. When
wr
or
write transactions to internal registers are possible.
Register address bus. Selects one of the internal registers. See
Table 2
.
Data input bus. The microprocessor writes to internal registers via the
din[7..0]
bus.
Baud out. Transmitter clock that is controlled by the programmable baud
rate generator. Operates at 16 times the baud rate clock.
Chip select output. Indicates that the
cs0
,
cs1
and
ncs2
inputs are asserted).
Driver disable. Indicates that the microprocessor is reading data from the
a16450
. This output is intended as a disable or direction control between
the
a16450
and the microprocessor.
Data terminal ready. Indicates that the
This output is controlled by writing to bit 0 of the modem control register.
Interrupt. Indicates that an enabled interrupt condition has been met.
User-programmable output 1. This output is controlled by writing to bit 2 of
the modem control register.
User-programmable output 2. This output is controlled by writing to bit 3 of
the modem control register.
Request to send. Indicates that the
a16450
is ready to exchange data. This
output is controlled by writing to bit 1 of the modem control register.
Serial data out. Serial (transmitter) data out. When
mr
is asserted, the
sout
output is asserted.
Data output bus.
a16450
.
wr
High
wr
or
nwr
is asserted and the
a16450
is selected,
nwr
Input
Low
nwr
is asserted and the
a16450
is selected,
a[2..0]
Input
Input
–
–
din[7..0]
nbaudout
Output
Low
csout
Output
High
a16450
has been selected (i.e., the
ddis
Output
High
ndtr
Output
Low
a16450
is ready to exchange data.
intr
Output
Output
High
Low
nout1
nout2
Output
Low
nrts
Output
Low
sout
Output
High
dout[7..0]
Output
–
Table 1. a16450 Ports (Part 2 of 2)
Name
Type
Polarity
Description
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