參數(shù)資料
型號(hào)： XRT16C854
廠商： Exar Corporation
英文描述： 2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
中文描述： 2.97V至5.5V四路UART的128字節(jié)FIFO
文件頁數(shù)： 6/54頁
文件大?。?/td> 485K
代理商： XRT16C854
XR16C854/854D
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
xr
REV. 3.0.1
6
TXRDY#
-
39
45
O
Transmitter Ready (active low). This output is a logically wire-
ORed status of TXRDY# A-D. See
Table 5
. If this output is
unused, leave it unconnected.
RXRDY#
-
38
44
O
Receiver Ready (active low). This output is a logically wire-ORed
status of RXRDY# A-D. See
Table 5
. If this output is unused,
leave it unconnected.
FSRS#
-
-
76
I
FIFO Status Register Select (active low input with internal pull-up).
The content of the FSTAT register is placed on the data bus when
this pin becomes active. However it should be noted, D0-D3 con-
tain the inverted logic states of TXRDY# A-D pins, and D4-D7 the
logic states (un-inverted) of RXRDY# A-D pins. Address line is not
required when reading this status register.
MODEM OR SERIAL I/O INTERFACE
TXA
TXB
TXC
TXD
8
10
39
41
17
19
51
53
14
16
65
67
O
UART channels A-D Transmit Data and infrared transmit data.
Standard transmit and receive interface is enabled when MCR[6] =
0. In this mode, the TX signal will be a logic 1 during reset, or idle
(no data). Infrared IrDA transmit and receive interface is enabled
when MCR[6] = 1. In the Infrared mode, the inactive state (no
data) for the Infrared encoder/decoder interface is a logic 0.
IRTXA
IRTXB
IRTXC
IRTXD
-
-
-
-
-
-
-
-
6
24
57
75
O
UART channel A-D Infrared Transmit Data. The inactive state (no
data) for the Infrared encoder/decoder interface is a logic 0.
Regardless of the logic state of MCR bit-6, this pin will be operating
in the Infrared mode.
RXA
RXB
RXC
RXD
62
20
29
51
7
29
41
63
97
34
47
85
I
UART channel A-D Receive Data or infrared receive data. Normal
receive data input must idle at logic 1 condition. The infrared
receiver pulses typically idles at logic 0 but can be inverted by soft-
ware control prior going in to the decoder, see FCTR[2].
RTSA#
RTSB#
RTSC#
RTSD#
5
13
36
44
14
22
48
56
11
19
62
70
O
UART channels A-D Request-to-Send (active low) or general pur-
pose output. This output must be asserted prior to using auto RTS
flow control, see EFR[6], MCR[1], FCTR[1:0], EMSR[5:4] and
IER[6]. Also see
Figure 11
. If these outputs are not used, leave
them unconnected.
CTSA#
CTSB#
CTSC#
CTSD#
2
16
33
47
11
25
45
59
8
22
59
73
I
UART channels A-D Clear-to-Send (active low) or general purpose
input. It can be used for auto CTS flow control, see EFR[7], and
IER[7]. Also see
Figure 11
. These inputs should be connected
to VCC when not used.
DTRA#
DTRB#
DTRC#
DTRD#
3
15
34
46
12
24
46
58
9
21
60
72
O
UART channels A-D Data-Terminal-Ready (active low) or general
purpose output. If these outputs are not used, leave them uncon-
nected.
DSRA#
DSRB#
DSRC#
DSRD#
1
17
32
48
10
26
44
60
7
23
58
74
I
UART channels A-D Data-Set-Ready (active low) or general pur-
pose input. This input should be connected to VCC when not used.
Pin Description
N
AME
64-LQFP
P
IN
#
68-PLCC
P
IN
#
100-QFP
P
IN
#
T
YPE
D
ESCRIPTION
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