NXP Semiconductors
SC16C550B
5 V, 3.3 V and 2.5 V UART with 16-byte FIFOs
© NXP Semiconductors N.V. 2014. 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: 16 December 2014
Document identifier: SC16C550B
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 and benefits . . . . . . . . . . . . . . . . . . . . 1
3 Ordering information. . . . . . . . . . . . . . . . . . . . . 2
4 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5 Pinning information. . . . . . . . . . . . . . . . . . . . . . 4
5.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
5.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 6
6 Functional description . . . . . . . . . . . . . . . . . . . 9
6.1 Internal registers. . . . . . . . . . . . . . . . . . . . . . . 10
6.2 FIFO operation . . . . . . . . . . . . . . . . . . . . . . . . 10
6.3 Autoflow control . . . . . . . . . . . . . . . . . . . . . . . 11
6.3.1 Auto-RTS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.3.2 Auto-CTS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.3.3 Enabling autoflow control and auto-CTS . . . . 12
6.3.4 Auto-CTS and auto-RTS functional timing . . . 12
6.4 Hardware/software and time-out interrupts. . . 13
6.5 Programmable baud rate generator . . . . . . . . 14
6.6 DMA operation . . . . . . . . . . . . . . . . . . . . . . . . 15
6.7 Loopback mode . . . . . . . . . . . . . . . . . . . . . . . 16
7 Register descriptions . . . . . . . . . . . . . . . . . . . 18
7.1 Transmit Holding Register (THR) and
Receive Holding Register (RHR) . . . . . . . . . . 19
7.2 Interrupt Enable Register (IER) . . . . . . . . . . . 19
7.2.1 IER versus Receive FIFO interrupt mode
operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.2.2 IER versus Receive/Transmit FIFO polled
mode operation. . . . . . . . . . . . . . . . . . . . . . . . 20
7.3 FIFO Control Register (FCR) . . . . . . . . . . . . . 20
7.3.1 DMA mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.3.1.1 Mode 0 (FCR bit 3 = 0). . . . . . . . . . . . . . . . . . 20
7.3.1.2 Mode 1 (FCR bit 3 = 1). . . . . . . . . . . . . . . . . . 20
7.3.2 FIFO mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.4 Interrupt Status Register (ISR) . . . . . . . . . . . . 22
7.5 Line Control Register (LCR) . . . . . . . . . . . . . . 23
7.6 Modem Control Register (MCR). . . . . . . . . . . 25
7.7 Line Status Register (LSR). . . . . . . . . . . . . . . 26
7.8 Modem Status Register (MSR). . . . . . . . . . . . 27
7.9 Scratchpad Register (SPR) . . . . . . . . . . . . . . 28
7.10 SC16C550B external reset conditions . . . . . . 28
8 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 28
9 Static characteristics. . . . . . . . . . . . . . . . . . . . 29
10 Dynamic characteristics . . . . . . . . . . . . . . . . . 30
10.1 Timing diagrams . . . . . . . . . . . . . . . . . . . . . . . 32
11 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 38
12 Soldering of SMD packages . . . . . . . . . . . . . . 42
12.1 Introduction to soldering . . . . . . . . . . . . . . . . . 42
12.2 Wave and reflow soldering. . . . . . . . . . . . . . . 42
12.3 Wave soldering . . . . . . . . . . . . . . . . . . . . . . . 42
12.4 Reflow soldering . . . . . . . . . . . . . . . . . . . . . . 43
13 Soldering of through-hole mount packages. 44
13.1 Introduction to soldering through-hole mount
packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
13.2 Soldering by dipping or by solder wave . . . . . 44
13.3 Manual soldering . . . . . . . . . . . . . . . . . . . . . . 44
13.4 Package related soldering information. . . . . . 45
14 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 45
15 Revision history . . . . . . . . . . . . . . . . . . . . . . . 46
16 Legal information . . . . . . . . . . . . . . . . . . . . . . 47
16.1 Data sheet status. . . . . . . . . . . . . . . . . . . . . . 47
16.2 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
16.3 Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . 47
16.4 Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 48
17 Contact information . . . . . . . . . . . . . . . . . . . . 48
18 Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
