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參數(shù)資料
| 型號(hào)： | SC16C2552 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Dual UART with 16-byte transmit and receive FIFOs |
| 中文描述： | 雙UART具有16字節(jié)的傳輸和接收FIFO |
| 文件頁數(shù)： | 8/38頁 |
| 文件大?。?/td> | 579K |
| 代理商： | SC16C2552 |
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Philips Semiconductors
SC16C2552
Dual UART with 16-byte transmit and receive FIFOs
Product data
Rev. 03 — 20 June 2003
8 of 38
9397 750 11636
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
6.3 FIFO operation
The 16 byte transmit and receive data FIFOs are enabled by the FIFO Control
Register (FCR) bit 0. The user can set the receive trigger level via FCR bits 6-7, but
not the transmit trigger level. The transmit interrupt trigger level is set to 16 following a
reset. The receiver FIFO section includes a time-out function to ensure data is
delivered to the external CPU. An interrupt is generated whenever the Receive
Holding Register (RHR) has not been read following the loading of a character or the
receive trigger level has not been reached.
6.4 Time-out interrupts
The interrupts are enabled by IER[0-3]. Care must be taken when handling these
interrupts. Following a reset the transmitter interrupt is enabled, the SC16C2552 will
issue an interrupt to indicate that Transmit Holding Register is empty. This interrupt
must be serviced prior to continuing operations. The LSR register provides the
current singular highest priority interrupt only. It could be noted that CTS and RTS
interrupts have lowest interrupt priority. A condition can exist where a higher priority
interrupt may mask the lower priority CTS/RTS interrupt(s). Only after servicing the
higher pending interrupt will the lower priority CTS/RTS interrupt(s) be reflected in the
status register. Servicing the interrupt without investigating further interrupt conditions
can result in data errors.
When two interrupt conditions have the same priority, it is important to service these
interrupts correctly. Receive Data Ready and Receive Time Out have the same
interrupt priority (when enabled by IER[0]). The receiver issues an interrupt after the
number of characters have reached the programmed trigger level. In this case, the
SC16C2552 FIFO may hold more characters than the programmed trigger level.
Following the removal of a data byte, the user should re-check LSR[0] for additional
characters. A Receive Time Out will not occur if the receive FIFO is empty. The
time-out counter is reset at the center of each stop bit received or each time the
receive holding register (RHR) is read. The actual time-out value is 4 character time.
6.5 Programmable baud rate generator
The SC16C2552 supports high speed modem technologies that have increased input
data rates by employing data compression schemes. For example, a 33.6 kbit/s
modem that employs data compression may require a 115.2 kbit/s input data rate.
A 128.0 kbit/s ISDN modem that supports data compression may need an input
data rate of 460.8 kbit/s.
A baud rate generator is provided for each UART channel, allowing independent
TX/RX channel control. The programmable Baud Rate Generator is capable of
accepting an input clock up to 80 MHz, as required for supporting a 5 Mbits/s data
rate. The SC16C2552 can be configured for internal or external clock operation. For
internal clock oscillator operation, an industry standard microprocessor crystal is
connected externally between the XTAL1 and XTAL2 pins. Alternatively, an external
clock can be connected to the XTAL1 pin to clock the internal baud rate generator for
standard or custom rates (see
Table 5
).
The generator divides the input 16
×
clock by any divisor from 1 to 2
16
1. The
SC16C2552 divides the basic external clock by 16. The basic 16
×
clock provides
table rates to support standard and custom applications using the same system
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC16C2552B | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 16-byte FIFOs |
| SC16C2552BIA44 | 功能描述:UART 接口集成電路 16CB 2.5V-5V 2CH 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 |
| SC16C2552BIA44,512 | 功能描述:UART 接口集成電路 16CB 2.5V-5V 2CH 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 |
| SC16C2552BIA44,518 | 功能描述:UART 接口集成電路 16CB 2.5V-5V 2CH 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 |
| SC16C2552BIA44,529 | 功能描述:UART 接口集成電路 2CH. 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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