SC68C752B datasheet(49/49 Pages) PHILIPS

49 / 49 page

All rights are reserved. Reproduction in whole or in part is prohibited without the prior

written consent of the copyright owner. The information presented in this document does

not form part of any quotation or contract, is believed to be accurate and reliable and may

be changed without notice. No liability will be accepted by the publisher for any

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: 29 November 2005

Document number: SC68C752B_3

Published in The Netherlands

Philips Semiconductors

SC68C752B

5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs

21. Contents

General description . . . . . . . . . . . . . . . . . . . . . . 1

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Ordering information . . . . . . . . . . . . . . . . . . . . . 2

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Pinning information . . . . . . . . . . . . . . . . . . . . . . 4

5.1

Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

5.2

Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5

Functional description . . . . . . . . . . . . . . . . . . . 8

6.1

Trigger levels. . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6.2

Hardware ﬂow control . . . . . . . . . . . . . . . . . . . . 8

6.2.1

Auto-RTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

6.2.2

Auto-CTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.3

Software ﬂow control . . . . . . . . . . . . . . . . . . . 10

6.3.1

Receive ﬂow control . . . . . . . . . . . . . . . . . . . . 11

6.3.2

Transmit ﬂow control . . . . . . . . . . . . . . . . . . . . 11

6.3.3

Software ﬂow control example . . . . . . . . . . . . 12

6.3.3.1

Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . 12

6.4

Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6.5

Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6.5.1

Interrupt mode operation . . . . . . . . . . . . . . . . 15

6.5.2

Polled mode operation . . . . . . . . . . . . . . . . . . 15

6.6

DMA operation . . . . . . . . . . . . . . . . . . . . . . . . 16

6.6.1

Single DMA transfers (DMA mode 0/FIFO

disable) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6.6.1.1

Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6.6.1.2

Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6.6.2

Block DMA transfers (DMA mode 1). . . . . . . . 17

6.6.2.1

Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.6.2.2

Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.7

Sleep mode. . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.8

Break and time-out conditions . . . . . . . . . . . . 18

6.9

Programmable baud rate generator . . . . . . . . 18

7.1

Receiver Holding Register (RHR) . . . . . . . . . . 22

7.2

Transmit Holding Register (THR) . . . . . . . . . . 22

7.3

FIFO Control Register (FCR) . . . . . . . . . . . . . 23

7.4

Line Control Register (LCR) . . . . . . . . . . . . . . 24

7.5

Line Status Register (LSR) . . . . . . . . . . . . . . . 25

7.6

Modem Control Register (MCR) . . . . . . . . . . . 26

7.7

Modem Status Register (MSR). . . . . . . . . . . . 27

7.8

Interrupt Enable Register (IER) . . . . . . . . . . . 28

7.9

Interrupt Identiﬁcation Register (IIR). . . . . . . . 29

7.10

Enhanced Feature Register (EFR) . . . . . . . . . 30

7.11

Divisor latches (DLL, DLH) . . . . . . . . . . . . . . . 30

7.12

Transmission Control Register (TCR) . . . . . . . 30

7.13

Trigger Level Register (TLR). . . . . . . . . . . . . . 31

7.14

FIFO ready register. . . . . . . . . . . . . . . . . . . . . 31

Programmer’s guide . . . . . . . . . . . . . . . . . . . . 32

Limiting values . . . . . . . . . . . . . . . . . . . . . . . . 34

Static characteristics . . . . . . . . . . . . . . . . . . . 35

Dynamic characteristics . . . . . . . . . . . . . . . . . 36

11.1

Timing diagrams. . . . . . . . . . . . . . . . . . . . . . . 37

Package outline . . . . . . . . . . . . . . . . . . . . . . . . 42

Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

13.1

Introduction to soldering surface mount

packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

13.2

Reﬂow soldering. . . . . . . . . . . . . . . . . . . . . . . 44

13.3

Wave soldering. . . . . . . . . . . . . . . . . . . . . . . . 44

13.4

Manual soldering . . . . . . . . . . . . . . . . . . . . . . 45

13.5

Package related soldering information . . . . . . 45

Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 46

Revision history . . . . . . . . . . . . . . . . . . . . . . . 47

Data sheet status. . . . . . . . . . . . . . . . . . . . . . . 48

Deﬁnitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Contact information . . . . . . . . . . . . . . . . . . . . 48

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