© Koninklijke Philips Electronics N.V. 2005
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consequence of its use. Publication thereof does not convey nor imply any license under
patent- or other industrial or intellectual property rights.
Date of release: 20 June 2005
Document number: 9397 750 14965
Published in The Netherlands
Philips Semiconductors
SC16C654B/654DB
5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 64-byte FIFOs
20. Contents
1 General description . . . . . . . . . . . . . . . . . . . . . . 1
2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3 Ordering information . . . . . . . . . . . . . . . . . . . . . 2
4 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5 Pinning information. . . . . . . . . . . . . . . . . . . . . . 5
5.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . 10
6 Functional description . . . . . . . . . . . . . . . . . . 14
6.1 Interface options . . . . . . . . . . . . . . . . . . . . . . . 16
6.1.1 The 16 mode interface . . . . . . . . . . . . . . . . . . 16
6.1.2 The 68 mode interface . . . . . . . . . . . . . . . . . . 16
6.2 Internal registers. . . . . . . . . . . . . . . . . . . . . . . 17
6.3 FIFO operation . . . . . . . . . . . . . . . . . . . . . . . . 17
6.4 Hardware flow control. . . . . . . . . . . . . . . . . . . 18
6.5 Software flow control . . . . . . . . . . . . . . . . . . . 18
6.6 Special feature software flow control . . . . . . . 19
6.7 Xon any feature . . . . . . . . . . . . . . . . . . . . . . . 19
6.8 Hardware/software and time-out interrupts. . . 19
6.9 Programmable baud rate generator . . . . . . . . 20
6.10 DMA operation . . . . . . . . . . . . . . . . . . . . . . . . 22
6.11 Sleep mode. . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.12 Loop-back mode. . . . . . . . . . . . . . . . . . . . . . . 22
7 Register descriptions . . . . . . . . . . . . . . . . . . . 24
7.1 Transmit (THR) and Receive (RHR) Holding
Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.2 Interrupt Enable Register (IER) . . . . . . . . . . . 25
7.2.1 IER versus Receive FIFO interrupt mode
operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.2.2 IER versus Receive/Transmit FIFO polled mode
operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.3 FIFO Control Register (FCR) . . . . . . . . . . . . . 27
7.3.1 DMA mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.3.1.1 Mode 0 (FCR bit 3 = 0). . . . . . . . . . . . . . . . . . 27
7.3.1.2 Mode 1 (FCR bit 3 = 1). . . . . . . . . . . . . . . . . . 27
7.3.2 FIFO mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.4 Interrupt Status Register (ISR) . . . . . . . . . . . . 29
7.5 Line Control Register (LCR) . . . . . . . . . . . . . . 30
7.6 Modem Control Register (MCR) . . . . . . . . . . . 31
7.7 Line Status Register (LSR). . . . . . . . . . . . . . . 33
7.8 Modem Status Register (MSR). . . . . . . . . . . . 34
7.9 Scratchpad Register (SPR) . . . . . . . . . . . . . . 35
7.10 Enhanced Feature Register (EFR) . . . . . . . . . 35
7.11 SC16C654B/654DB external reset conditions 36
8 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 37
9 Static characteristics. . . . . . . . . . . . . . . . . . . . 38
10 Dynamic characteristics . . . . . . . . . . . . . . . . . 39
10.1 Timing diagrams. . . . . . . . . . . . . . . . . . . . . . . 41
11 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 48
12 Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
12.1 Introduction to soldering surface mount
packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
12.2 Reflow soldering. . . . . . . . . . . . . . . . . . . . . . . 53
12.3 Wave soldering. . . . . . . . . . . . . . . . . . . . . . . . 53
12.4 Manual soldering . . . . . . . . . . . . . . . . . . . . . . 54
12.5 Package related soldering information. . . . . . 54
13 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 55
14 Revision history . . . . . . . . . . . . . . . . . . . . . . . 56
15 Data sheet status. . . . . . . . . . . . . . . . . . . . . . . 57
16 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
17 Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
18 Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
19 Contact information . . . . . . . . . . . . . . . . . . . . 57
