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| 型號(hào)： | SC16C550 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Universal Asynchronous Receiver/Transmitter (UART) with 16-byte FIFO and infrared (IrDA) encoder/decoder |
| 中文描述： | 通用異步接收器/發(fā)送器（UART），16字節(jié)FIFO和紅外線（IrDA）編碼器/解碼器 |
| 文件頁數(shù)： | 20/52頁 |
| 文件大?。?/td> | 639K |
| 代理商： | SC16C550 |
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Philips Semiconductors
SC16C550
UART with 16-byte FIFO and IrDA encoder/decoder
Product data
Rev. 05 — 19 June 2003
20 of 52
9397 750 11619
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
7.1 Transmit (THR) and Receive (RHR) Holding Registers
The serial transmitter section consists of an 8-bit Transmit Hold Register (THR) and
Transmit Shift Register (TSR). The status of the THR is provided in the Line Status
Register (LSR). Writing to the THR transfers the contents of the data bus (D7-D0) to
the THR, providing that the THR or TSR is empty. The THR empty flag in the LSR
register will be set to a logic 1 when the transmitter is empty or when data is
transferred to the TSR. Note that a write operation can be performed when the THR
empty flag is set (logic 0 = FIFO full; logic 1 = at least one FIFO location available).
The serial receive section also contains an 8-bit Receive Holding Register (RHR).
Receive data is removed from the SC16C550 and receive FIFO by reading the RHR
register. The receive section provides a mechanism to prevent false starts. On the
falling edge of a start or false start bit, an internal receiver counter starts counting
clocks at the 16
×
clock rate. After 7-
1
2
clocks, the start bit time should be shifted to
the center of the start bit. At this time the start bit is sampled, and if it is still a logic 0
it is validated. Evaluating the start bit in this manner prevents the receiver from
assembling a false character. Receiver status codes will be posted in the LSR.
7.2 Interrupt Enable Register (IER)
The Interrupt Enable Register (IER) masks the interrupts from receiver ready,
transmitter empty, line status and modem status registers. These interrupts would
normally be seen on the INT output pin.
Table 9:
Bit
7
Interrupt Enable Register bits description
Symbol
Description
IER[7]
CTS interrupt.
Logic 0 = Disable the CTS interrupt (normal default condition).
Logic 1 = Enable the CTS interrupt. The SC16C550 issues an interrupt
when the CTS pin transitions from a logic 0 to a logic 1.
IER[6]
RTS interrupt.
Logic 0 = Disable the RTS interrupt (normal default condition).
Logic 1 = Enable the RTS interrupt. The SC16C550 issues an interrupt
when the RTS pin transitions from a logic 0 to a logic 1.
IER[5]
Xoff interrupt.
Logic 0 = Disable the software flow control, receive Xoff interrupt
(normal default condition).
Logic 1 = Enable the software flow control, receive Xoff interrupt. See
Section 6.4 “Software flow control”
for details.
IER[4]
Sleep mode.
Logic 0 = Disable sleep mode (normal default condition).
Logic 1 = Enable sleep mode. See
Section 6.9 “Sleep mode”
for details.
IER[3]
Modem Status Interrupt.
Logic 0 = Disable the modem status register interrupt (normal default
condition).
Logic 1 = Enable the modem status register interrupt.
6
5
4
3
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相關(guān)代理商/技術(shù)參數(shù) |
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| SC16C550B | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:5 V, 3.3 V and 2.5 V UART with 16-byte FIFOs |
| SC16C550BIA44 | 功能描述:UART 接口集成電路 16CB 2.5V-5V 1CH 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 |
| SC16C550BIA44,512 | 功能描述:UART 接口集成電路 16CB 2.5V-5V 1CH 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 |
| SC16C550BIA44,518 | 功能描述:UART 接口集成電路 1CH. 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 |
| SC16C550BIA44,529 | 功能描述:UART 接口集成電路 16CB 2.5V-5V 1CH 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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