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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
2
3
3.1
4
5
5.1
5.2
6
6.1
6.2
6.3
6.4
6.5
6.6
6.7
7
7.1
General description. . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Ordering information. . . . . . . . . . . . . . . . . . . . . 2
Ordering options. . . . . . . . . . . . . . . . . . . . . . . . 2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pinning information. . . . . . . . . . . . . . . . . . . . . . 4
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 6
Functional description . . . . . . . . . . . . . . . . . . . 9
UART A-B functions . . . . . . . . . . . . . . . . . . . . . 9
Internal registers. . . . . . . . . . . . . . . . . . . . . . . 10
FIFO operation . . . . . . . . . . . . . . . . . . . . . . . . 11
Hardware/software and time-out interrupts. . . 11
Programmable baud rate generator . . . . . . . . 12
DMA operation . . . . . . . . . . . . . . . . . . . . . . . . 13
Loopback mode . . . . . . . . . . . . . . . . . . . . . . . 13
Register descriptions . . . . . . . . . . . . . . . . . . . 15
Transmit Holding Register (THR) and Receive
Holding Register (RHR) . . . . . . . . . . . . . . . . . 15
Interrupt Enable Register (IER) . . . . . . . . . . . 16
IER versus Transmit/Receive FIFO interrupt
mode operation. . . . . . . . . . . . . . . . . . . . . . . . 17
IER versus Receive/Transmit FIFO polled
mode operation. . . . . . . . . . . . . . . . . . . . . . . . 17
FIFO Control Register (FCR) . . . . . . . . . . . . . 17
DMA mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Mode 0 (FCR bit 3 = 0). . . . . . . . . . . . . . . . . . 17
Mode 1 (FCR bit 3 = 1). . . . . . . . . . . . . . . . . . 17
FIFO mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Interrupt Status Register (ISR) . . . . . . . . . . . . 19
Line Control Register (LCR) . . . . . . . . . . . . . . 20
Modem Control Register (MCR). . . . . . . . . . . 21
Line Status Register (LSR). . . . . . . . . . . . . . . 22
Modem Status Register (MSR). . . . . . . . . . . . 23
Scratchpad Register (SPR) . . . . . . . . . . . . . . 24
SC16C2550B external reset condition . . . . . . 24
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 25
Static characteristics. . . . . . . . . . . . . . . . . . . . 25
Dynamic characteristics . . . . . . . . . . . . . . . . . 26
Timing diagrams . . . . . . . . . . . . . . . . . . . . . . . 27
Package outline . . . . . . . . . . . . . . . . . . . . . . . . 33
Soldering of SMD packages . . . . . . . . . . . . . . 37
Introduction to soldering . . . . . . . . . . . . . . . . . 37
Wave and reflow soldering . . . . . . . . . . . . . . . 37
Wave soldering. . . . . . . . . . . . . . . . . . . . . . . . 37
7.2
7.2.1
7.2.2
7.3
7.3.1
7.3.1.1
7.3.1.2
7.3.2
7.4
7.5
7.6
7.7
7.8
7.9
7.10
8
9
10
10.1
11
12
12.1
12.2
12.3
12.4
13
13.1
Reflow soldering. . . . . . . . . . . . . . . . . . . . . . . 38
Soldering of through-hole mount packages. 39
Introduction to soldering through-hole mount
packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Soldering by dipping or by solder wave . . . . . 39
Manual soldering . . . . . . . . . . . . . . . . . . . . . . 39
Package related soldering information. . . . . . 40
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 40
Revision history . . . . . . . . . . . . . . . . . . . . . . . 41
Legal information . . . . . . . . . . . . . . . . . . . . . . 42
Data sheet status. . . . . . . . . . . . . . . . . . . . . . 42
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Contact information . . . . . . . . . . . . . . . . . . . . 42
Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
13.2
13.3
13.4
14
15
16
16.1
16.2
16.3
16.4
17
18