NXP Semiconductors
SC16C2550B
5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 16-byte FIFOs
© NXP B.V. 2009. All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
Date of release: 12 January 2009
Document identifier: SC16C2550B_5
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
18. Contents
1 General description. . . . . . . . . . . . . . . . . . . . . . 1
2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3 Ordering information. . . . . . . . . . . . . . . . . . . . . 2
3.1 Ordering options . . . . . . . . . . . . . . . . . . . . . . . . 2
4 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5 Pinning information. . . . . . . . . . . . . . . . . . . . . . 4
5.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
5.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 6
6 Functional description . . . . . . . . . . . . . . . . . . . 9
6.1 UART A-B functions . . . . . . . . . . . . . . . . . . . . . 9
6.2 Internal registers. . . . . . . . . . . . . . . . . . . . . . . 10
6.3 FIFO operation . . . . . . . . . . . . . . . . . . . . . . . . 11
6.4 Hardware/software and time-out interrupts. . . 11
6.5 Programmable baud rate generator . . . . . . . . 12
6.6 DMA operation . . . . . . . . . . . . . . . . . . . . . . . . 13
6.7 Loopback mode . . . . . . . . . . . . . . . . . . . . . . . 13
7 Register descriptions . . . . . . . . . . . . . . . . . . . 15
7.1 Transmit Holding Register (THR) and Receive
Holding Register (RHR) . . . . . . . . . . . . . . . . . 15
7.2 Interrupt Enable Register (IER) . . . . . . . . . . . 16
7.2.1 IER versus Transmit/Receive FIFO interrupt
mode operation. . . . . . . . . . . . . . . . . . . . . . . . 17
7.2.2 IER versus Receive/Transmit FIFO polled
mode operation. . . . . . . . . . . . . . . . . . . . . . . . 17
7.3 FIFO Control Register (FCR) . . . . . . . . . . . . . 17
7.3.1 DMA mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.3.1.1 Mode 0 (FCR bit 3 = 0). . . . . . . . . . . . . . . . . . 17
7.3.1.2 Mode 1 (FCR bit 3 = 1). . . . . . . . . . . . . . . . . . 17
7.3.2 FIFO mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.4 Interrupt Status Register (ISR) . . . . . . . . . . . . 19
7.5 Line Control Register (LCR) . . . . . . . . . . . . . . 20
7.6 Modem Control Register (MCR) . . . . . . . . . . . 21
7.7 Line Status Register (LSR). . . . . . . . . . . . . . . 22
7.8 Modem Status Register (MSR). . . . . . . . . . . . 23
7.9 Scratchpad Register (SPR) . . . . . . . . . . . . . . 24
7.10 SC16C2550B external reset condition . . . . . . 24
8 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 25
9 Static characteristics. . . . . . . . . . . . . . . . . . . . 25
10 Dynamic characteristics . . . . . . . . . . . . . . . . . 26
10.1 Timing diagrams . . . . . . . . . . . . . . . . . . . . . . . 27
11 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 33
12 Soldering of SMD packages . . . . . . . . . . . . . . 37
12.1 Introduction to soldering . . . . . . . . . . . . . . . . . 37
12.2 Wave and reflow soldering . . . . . . . . . . . . . . . 37
12.3 Wave soldering . . . . . . . . . . . . . . . . . . . . . . . . 37
12.4 Reflow soldering. . . . . . . . . . . . . . . . . . . . . . . 38
13 Soldering of through-hole mount packages. 39
13.1 Introduction to soldering through-hole mount
packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
13.2 Soldering by dipping or by solder wave . . . . . 39
13.3 Manual soldering . . . . . . . . . . . . . . . . . . . . . . 39
13.4 Package related soldering information. . . . . . 40
14 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 40
15 Revision history . . . . . . . . . . . . . . . . . . . . . . . 41
16 Legal information . . . . . . . . . . . . . . . . . . . . . . 42
16.1 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 42
16.2 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
16.3 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 42
16.4 Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 42
17 Contact information . . . . . . . . . . . . . . . . . . . . 42
18 Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
