參數(shù)資料
型號： SC16C554B
廠商： NXP Semiconductors N.V.
英文描述： 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs
中文描述： 5伏，3.3伏和2.5伏兆5四異步/秒（最大），16字節(jié)的FIFO
文件頁數(shù)： 32/51頁
文件大?。?/td> 253K
代理商： SC16C554B
9397 750 13133
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 9 February 2005
32 of 51
Philips Semiconductors
SC16C554B/554DB
5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs
7.8 Modem Status Register (MSR)
This register provides the current state of the control interface signals from the modem, or
other peripheral device to which the SC16C554B/554DB is connected. 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.
0
LSR[0]
Receive data ready.
Logic 0 = No data in receive holding register or FIFO (normal default
condition).
Logic 1 = Data has been received and is saved in the receive holding
register or FIFO.
Table 20:
Bit
Line Status Register bits description
…continued
Symbol
Description
Table 21:
Bit
7
Modem Status Register bits description
Symbol
Description
MSR[7]
CD (active HIGH, logical 1). Normally this bit is the complement of the CD
input. In the loop-back mode this bit is equivalent to the OP2 bit in the MCR
register.
MSR[6]
RI (active HIGH, logical 1). Normally this bit is the complement of the RI
input. In the loop-back mode this bit is equivalent to the OP1 bit in the MCR
register.
MSR[5]
DSR (active HIGH, logical 1). Normally this bit is the complement of the DSR
input. In loop-back mode this bit is equivalent to the DTR bit in the MCR
register.
MSR[4]
CTS (active HIGH, logical 1). CTS functions as hardware flow control signal
input if it is enabled via MCR[5]. Flow control (when enabled) allows starting
and stopping the transmissions based on the external modem CTS signal. A
logic 1 at the CTS pin will stop SC16C554B/554DB transmissions as soon
as current character has finished transmission. Normally MSR[4] is the
complement of the CTS input. However, in the loop-back mode, this bit is
equivalent to the RTS bit in the MCR register.
MSR[3]
CD
[1]
Logic 0 = No CD change (normal default condition).
Logic 1 = The CD input to the SC16C554B/554DB has changed state
since the last time it was read. A modem Status Interrupt will be
generated.
MSR[2]
RI
[1]
Logic 0 = No RI change (normal default condition).
Logic 1 = The RI input to the SC16C554B/554DB has changed from a
logic 0 to a logic 1. A modem Status Interrupt will be generated.
6
5
4
3
2
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SC16C554B_10 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs
SC16C554BIB64 功能描述:UART 接口集成電路 16CB 2.5V-5V 4CH UART 16B FIFO 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
SC16C554BIB64,128 功能描述:UART 接口集成電路 16CB 2.5V-5V 4CH 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
SC16C554BIB64,128 PBF 制造商:NXP Semiconductors 功能描述:
SC16C554BIB64,151 功能描述:UART 接口集成電路 4CH. UART 16B FIFO 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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