參數(shù)資料
型號(hào)： XR17C158
廠商： Exar Corporation
英文描述： PCI Bus Octal UART(八通用異步接收器/發(fā)送器（滿足通訊系統(tǒng)中PCI總線和高帶寬要求）)
中文描述： PCI總線八路的UART（八通用異步接收器/發(fā)送器（滿足通訊系統(tǒng)中的PCI總線和高帶寬要求））
文件頁(yè)數(shù)： 40/51頁(yè)
文件大?。?/td> 685K
代理商： XR17C158
PCI BUS OCTAL UART
XR17C158
PRELIMINARY
REV. 1.0.0
40
EFR[4]: Enhanced Function Bits Enable
Enhanced function control bit. This bit enables the
functions in IER bits 4-7, ISR bits 4-5, FCR bits 4-5,
and MCR bits 5-7 to be modified. After modifying any
enhanced bits, EFR bit-4 can be set to a logic 0 to
latch the new values. This feature prevents legacy
software from altering or overwriting the enhanced
functions once set. Normally, it is recommended to
leave it enabled, logic 1.
Logic 0 = modification disable/latch enhanced fea-
tures. IER bits 4-7, ISR bits 4-5, FCR bits 4-5, and
MCR bits 5-7 are saved to retain the user settings.
After a reset, the IER bits 4-7, ISR bits 4-5, FCR
bits 4-5, and MCR bits 5-7 are set to a logic 0 to be
compatible with ST16C554 mode. (default).
Logic 1 = Enables the enhanced functions. When
this bit is set to a logic 1 all enhanced features are
enabled.
EFR[5]: Special Character Detect Enable
Logic 0 = Special Character Detect Disabled.
(default)
Logic 1 = Special Character Detect Enabled. The
UART compares each incoming receive character
with data in Xoff-2 register. If a match exists, the
received data will be transferred to FIFO and ISR
bit-4 will be set to indicate detection of the special
character. Bit-0 corresponds with the LSB bit for the
receive character. If flow control is set for compar-
ing Xon1, Xoff1 (EFR [1:0]=10) then flow control
and special character work normally. However, if
flow control is set for comparing Xon2, Xoff2
(EFR[1:0]=01) then flow control works normally, but
Xoff2 will not go to the FIFO, and will generate an
Xoff interupt and a special character interrupt.
EFR[6]: AUTO RTS OR DTR FLOW CONTROL
ENABLE
RTS#/DTR# output may be used for hardware flow
control by setting EFR bit-6 to logic 1. When Auto
RTS/DTR is selected, an interrupt will be generated
when the receive FIFO is filled to the programmed
trigger level and RTS/DTR# will de-assert to a logic 1
at the next upper trigger or selected hysteresis level.
RTS/DTR# will return to a logic 0 when FIFO data
falls below the next lower trigger or selected hystere-
sis level (see FCTR bits 4-7). The RTS# or DTR# out-
put must be asserted (logic 0) before the auto RTS/
DTR can take effect. The selection for RTS# or DTR#
is through MCR bit-2. RTS/DTR# pin will function as a
general purpose output when hardware flow control is
disabled.
Logic 0 = Automatic RTS/DTR flow control is dis-
abled. (default)
Logic 1 = Enable Automatic RTS/DTR flow control.
EFR[7]: Auto CTS Flow Control Enable
Automatic CTS or DSR Flow Control.
T
ABLE
17: S
OFTWARE
F
LOW
C
ONTROL
F
UNCTIONS
EFR
BIT
-3
C
ONT
-3
EFR
BIT
-2
C
ONT
-2
EFR
BIT
-1
C
ONT
-1
EFR
BIT
-0
C
ONT
-0
T
RANSMIT
AND
R
ECEIVE
S
OFTWARE
F
LOW
C
ONTROL
0
0
1
0
1
X
X
X
1
0
0
0
1
1
X
X
X
0
0
X
X
X
X
0
1
0
1
0
X
X
X
X
0
0
1
1
No TX and RX flow control (default and reset)
No transmit flow control
Transmit Xon1/Xoff1
Transmit Xon2/Xoff2
Transmit Xon1 and Xon2/Xoff1 and Xoff2
No receive flow control
Receiver compares Xon1/Xoff1
Receiver compares Xon2/Xoff2
Transmit Xon1/ Xoff1,
Receiver compares Xon1 or Xon2, Xoff1 or Xoff2
Transmit Xon2/Xoff2,
Receiver compares Xon1 or Xon2, Xoff1 or Xoff2
Transmit Xon1 and Xon2/Xoff1 and Xoff2,
Receiver compares Xon1 and Xon2/Xoff1 and Xoff2
No transmit flow control,
Receiver compares Xon1 and Xon2/Xoff1 and Xoff2
0
1
1
1
1
1
1
1
0
0
1
1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR17C158CV 功能描述:UART 接口集成電路 UART 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
XR17C158CV-0A-EVB 功能描述:UART 接口集成電路 Supports C158 144 ld TQFP, PCI 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
XR17C158CV-F 功能描述:UART 接口集成電路 UART 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
XR17C158CVTR-F 制造商:Exar Corporation 功能描述:UART 8-CH 64Byte FIFO 5V 144-Pin LQFP T/R 制造商:Exar Corporation 功能描述:XR17C158CVTR-F
XR17C158IV 功能描述:UART 接口集成電路 UART 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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