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SC68C752B Datasheet(PDF) 48 Page - NXP Semiconductors |
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SC68C752B Datasheet(HTML) 48 Page - NXP Semiconductors |
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48 / 48 page ![]() NXP Semiconductors SC68C752B 5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs © NXP B.V. 2010. 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: 20 January 2010 Document identifier: SC68C752B_4 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 4 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3 5 Pinning information . . . . . . . . . . . . . . . . . . . . . . 4 5.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 5.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5 6 Functional description . . . . . . . . . . . . . . . . . . . 7 6.1 Trigger levels . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6.2 Hardware flow control . . . . . . . . . . . . . . . . . . . . 7 6.2.1 Auto-RTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6.2.2 Auto-CTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6.3 Software flow control . . . . . . . . . . . . . . . . . . . . 9 6.3.1 Receive flow control . . . . . . . . . . . . . . . . . . . . 10 6.3.2 Transmit flow control. . . . . . . . . . . . . . . . . . . . 10 6.3.3 Software flow control example . . . . . . . . . . . . 11 6.3.3.1 Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.4 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.5 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6.5.1 Interrupt mode operation . . . . . . . . . . . . . . . . 14 6.5.2 Polled mode operation . . . . . . . . . . . . . . . . . . 14 6.6 DMA operation . . . . . . . . . . . . . . . . . . . . . . . . 15 6.6.1 Single DMA transfers (DMA mode 0/FIFO disable). . . . . . . . . . . . . . 15 6.6.1.1 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 6.6.1.2 Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 6.6.2 Block DMA transfers (DMA mode 1). . . . . . . . 16 6.6.2.1 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6.6.2.2 Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6.7 Sleep mode . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6.8 Break and time-out conditions . . . . . . . . . . . . 17 6.9 Programmable baud rate generator . . . . . . . . 17 7 Register descriptions . . . . . . . . . . . . . . . . . . . 19 7.1 Receiver Holding Register (RHR). . . . . . . . . . 21 7.2 Transmit Holding Register (THR) . . . . . . . . . . 21 7.3 FIFO Control Register (FCR) . . . . . . . . . . . . . 22 7.4 Line Control Register (LCR) . . . . . . . . . . . . . . 23 7.5 Line Status Register (LSR) . . . . . . . . . . . . . . . 24 7.6 Modem Control Register (MCR) . . . . . . . . . . . 25 7.7 Modem Status Register (MSR) . . . . . . . . . . . . 26 7.8 Interrupt Enable Register (IER) . . . . . . . . . . . 27 7.9 Interrupt Identification Register (IIR). . . . . . . . 28 7.10 Enhanced Feature Register (EFR) . . . . . . . . . 29 7.11 Divisor latches (DLL, DLM). . . . . . . . . . . . . . . 29 7.12 Transmission Control Register (TCR). . . . . . . 29 7.13 Trigger Level Register (TLR) . . . . . . . . . . . . . 30 7.14 FIFO ready register . . . . . . . . . . . . . . . . . . . . 30 8 Programmer’s guide . . . . . . . . . . . . . . . . . . . . 31 9 Limiting values . . . . . . . . . . . . . . . . . . . . . . . . 33 10 Static characteristics . . . . . . . . . . . . . . . . . . . 34 11 Dynamic characteristics. . . . . . . . . . . . . . . . . 35 11.1 Timing diagrams. . . . . . . . . . . . . . . . . . . . . . . 36 12 Package outline. . . . . . . . . . . . . . . . . . . . . . . . 41 13 Soldering of SMD packages . . . . . . . . . . . . . . 43 13.1 Introduction to soldering. . . . . . . . . . . . . . . . . 43 13.2 Wave and reflow soldering. . . . . . . . . . . . . . . 43 13.3 Wave soldering . . . . . . . . . . . . . . . . . . . . . . . 43 13.4 Reflow soldering . . . . . . . . . . . . . . . . . . . . . . 44 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 . . . . . . . . . . . . . . . . . . . . . . . . . . 47 17 Contact information . . . . . . . . . . . . . . . . . . . . 47 18 Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 |
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