參數(shù)資料
型號(hào)： XR16C854
廠商： Exar Corporation
元件分類(lèi)： 通用總線功能
英文描述： QUAD UART WITH RX/TX FIFO COUNTERS,128-BYTE FIFO
中文描述： 四路與異步接收/發(fā)送FIFO的計(jì)數(shù)器,128字節(jié)FIFO
文件頁(yè)數(shù)： 32/51頁(yè)
文件大?。?/td> 476K
代理商： XR16C854
XR16C854
32
Rev. 1.00P
LSR BIT-7:
Logic 0 = No Error. (normal default condition)
Logic 1 = At least one parity error, framing error or
break indication is in the current FIFO data. This bit is
cleared when LSR register is read.
Modem Status Register (MSR)
This register provides the current state of the control
interface signals from the modem, or other peripheral
device that the 854 is connected to. Four bits of this
register are used to indicate the changed information.
These bits are set to a logic 1 whenever a control input
from the modem changes state. These bits are set to
a logic 0 whenever the CPU reads this register.
MSR BIT-0:
Logic 0 = No -CTS Change (normal default condition)
Logic 1 = The -CTS input to the 854 has changed state
since the last time it was read. A modem Status
Interrupt will be generated.
MSR BIT-1:
Logic 0 = No -DSR Change. (normal default condition)
Logic 1 = The -DSR input to the 854 has changed state
since the last time it was read. A modem Status
Interrupt will be generated.
MSR BIT-2:
Logic 0 = No -RI Change. (normal default condition)
Logic 1 = The -RI input to the 854 has changed from
a logic 0 to a logic 1. A modem Status Interrupt will be
generated.
MSR BIT-3:
Logic 0 = No -CD Change. (normal default condition)
Logic 1 = Indicates that the -CD input to the has
changed state since the last time it was read. A
modem Status Interrupt will be generated.
MSR BIT-4:
-CTS functions as hardware flow control signal input if
it is enabled via EFR bit-7. The transmit holding
register flow control is enabled/disabled by MSR bit-4.
Flow control (when enabled) allows the starting and
stopping the transmissions based on the external
modem -CTS signal. A logic 1 at the -CTS pin will stop
854 transmissions as soon as current character has
finished transmission.
Normally MSR bit-4 bit is the compliment of the -CTS
input. However in the loop-back mode, this bit is
equivalent to the RTS bit in the MCR register.
MSR BIT-5:
DSR (active high, logical 1). Normally this bit is the
compliment of the -DSR input. In the loop-back mode,
this bit is equivalent to the DTR bit in the MCR register.
MSR BIT-6:
RI (active high, logical 1). Normally this bit is the
compliment of the -RI input. In the loop-back mode
this bit is equivalent to the OP1 bit in the MCR register.
MSR BIT-7:
CD (active high, logical 1). Normally this bit is the
compliment of the -CD input. In the loop-back mode
this bit is equivalent to the OP2 bit in the MCR register.
Scratchpad Register (SPR)
The XR16C854 provides a temporary data register to
store 8 bits of user information.
Enhanced Feature Register (EFR)
Enhanced features are enabled or disabled using this
register.
Bits-0 through 4 provide single or dual character
software flow control selection (see table 8). When the
Xon1 and Xon2 and/or Xoff1 and Xoff2 modes are
selected, the double 8-bit words are concatenated into
two sequential characters.
EFR BIT 0-3: (logic 0 or cleared is the default condi-
tion)
Combinations of software flow control can be selected
by programming these bits.
相關(guān)PDF資料
PDF描述
XR16C854CJ QUAD UART WITH RX/TX FIFO COUNTERS,128-BYTE FIFO
XR16C854CQ QUAD UART WITH RX/TX FIFO COUNTERS,128-BYTE FIFO
XR16C854CV QUAD UART WITH RX/TX FIFO COUNTERS,128-BYTE FIFO
XR16C854DCV QUAD UART WITH RX/TX FIFO COUNTERS,128-BYTE FIFO
XR16C854DIV QUAD UART WITH RX/TX FIFO COUNTERS,128-BYTE FIFO
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR16C854CJ 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述:
XR16C854CJ-0A-EVB 功能描述:UART 接口集成電路 Supports C854 68 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
XR16C854CJ-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
XR16C854CJTR-F 制造商:Exar Corporation 功能描述:XR16C854CJTR-F
XR16C854CQ 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述:
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