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參數(shù)資料
| 型號： | XR16C2850 |
| 廠商： | Exar Corporation |
| 英文描述： | 3.3V AND 5V DUART WITH 128-BYTE FIFO |
| 中文描述： | 3.3V和5V杜阿爾特128字節(jié)FIFO |
| 文件頁數(shù)： | 15/43頁 |
| 文件大?。?/td> | 611K |
| 代理商： | XR16C2850 |
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XR16C2850
REV. 2.0.0
3.3V AND 5V DUART WITH 128-BYTE FIFO
á
15
time taken to send two characters at the programmed
baud rate) after the receive FIFO crosses the pro-
grammed trigger level (for all trigger tables A-D). To
clear this condition, the 2850 will transmit the pro-
grammed Xon-1,2 characters as soon as receive
FIFO is less than one trigger level below the pro-
grammed trigger level (for Trigger Tables A, B, and C)
or when receive FIFO is less than the trigger level mi-
nus the hysteresis value (for Trigger Table D). This
hysteresis value is the same as the Auto RTS Hyster-
esis value in Table 13. Table 6 below explains this
when Trigger Table-B (See Table 10) is selected.
* After the trigger level is reached, an xoff character is sent after a short span of time (= time required to send 2
characters); for example, after 2.083ms has elapsed for 9600 baud and 10-bit word length setting.
2.16 S
PECIAL
C
HARACTER
D
ETECT
A special character detect feature is provided to de-
tect an 8-bit character when bit-5 is set in the En-
hanced Feature Register (EFR). When this character
(Xoff2) is detected, it will be placed in the FIFO along
with normal incoming RX data.
The 2850 compares each incoming receive character
with Xoff-2 data. If a match exists, the received data
will be transferred to FIFO and ISR bit-4 will be set to
indicate detection of special character. Although the
Internal Register Table shows Xon, Xoff Registers
with eight bits of character information, the actual
number of bits is dependent on the programmed word
length. Line Control Register (LCR) bits 0-1 defines
the number of character bits, i.e., either 5 bits, 6 bits,
7 bits, or 8 bits. The word length selected by LCR bits
0-1 also determines the number of bits that will be
used for the special character comparison. Bit-0 in
the Xon, Xoff Registers corresponds with the LSB bit
for the receive character.
2.17 A
UTO
RS485 H
ALF
-
DUPLEX
C
ONTROL
The auto RS485 half-duplex direction control chang-
es the behavior of the transmitter when enabled by
FCTR bit-3. It de-asserts RTS# output following
the
last stop bit of the last character that has been trans-
mitted. This helps in turning around the transceiver to
receive the remote station’s response. When the host
is ready to transmit next polling data packet again, it
only has to load data bytes to the transmit FIFO. The
transmitter automatically re-asserts RTS# output pri-
or sending the data.
2.18 I
NFRARED
M
ODE
The 2850 UART includes the infrared encoder and
decoder compatible to the IrDA (Infrared Data Associ-
ation) version 1.0. The IrDA 1.0 standard that stipu-
lates the infrared encoder sends out a
3/16 of a bit
wide HIGH-pulse for each “0” bit in the transmit data
stream. This signal encoding reduces the on-time of
the infrared LED, hence reduces the power consump-
tion. See
Figure 12
below.
The infrared encoder and decoder are enabled by
setting MCR register bit-6 to a ‘1’. When the infrared
feature is enabled, the transmit data output, TX, idles
at logic zero level. Likewise, the RX input assumes an
idle level of logic zero from a reset and power up, see
Figure 12.
Typically, the wireless infrared decoder receives the
input pulse from the infrared sensing diode on the RX
pin. Each time it senses a light pulse, it returns a logic
1 to the data bit stream. However, this is not true with
some infrared modules on the market which indicate
a logic 0 by a light pulse. So the 2850 has a provision
to invert the input polarity to accomodate this. In this
case user can enable FCTR bit-2 to invert the input
signal.
T
ABLE
6: A
UTO
X
ON
/X
OFF
(S
OFTWARE
) F
LOW
C
ONTROL
RX T
RIGGER
L
EVEL
INT P
IN
A
CTIVATION
X
OFF
C
HARACTER
(
S
) S
ENT
(
CHARACTERS
IN
RX
FIFO
)
X
ON
C
HARACTER
(
S
) S
ENT
(
CHARACTERS
IN
RX
FIFO
)
8
8
8*
0
16
16
16*
8
24
24
24*
16
28
28
28*
24
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| XR16C2850_05 | 制造商:EXAR 制造商全稱:EXAR 功能描述:2.97V TO 5.5V DUAL UART WITH 128-BYTE FIFOS |
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| XR16C2850CJ-0A-EB | 功能描述:UART 接口集成電路 Supports C2850 44 ld PLCC, ISA Interface RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
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