sc68c752b NXP Semiconductors, sc68c752b Datasheet - Page 49

• Manufacturer Part Number: sc68c752b
• Description: 5 V, 3.3 V And 2.5 V Dual Uart, 5 Mbit/s Max. , With 64-byte Fifos And Motorola Up Interface
• Manufacturer: NXP Semiconductors

Philips Semiconductors
21. Contents
1
2
3
4
5
5.1
5.2
6
6.1
6.2
6.2.1
6.2.2
6.3
6.3.1
6.3.2
6.3.3
6.3.3.1
6.4
6.5
6.5.1
6.5.2
6.6
6.6.1
6.6.1.1
6.6.1.2
6.6.2
6.6.2.1
6.6.2.2
6.7
6.8
6.9
7
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
7.10
7.11
7.12
7.13
7.14
General description . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Ordering information . . . . . . . . . . . . . . . . . . . . . 2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pinning information . . . . . . . . . . . . . . . . . . . . . . 4
Functional description . . . . . . . . . . . . . . . . . . . 8
Register descriptions . . . . . . . . . . . . . . . . . . . 20
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5
Trigger levels. . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Hardware flow control . . . . . . . . . . . . . . . . . . . . 8
Auto-RTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Auto-CTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Software flow control . . . . . . . . . . . . . . . . . . . 10
Receive flow control . . . . . . . . . . . . . . . . . . . . 11
Transmit flow control . . . . . . . . . . . . . . . . . . . . 11
Software flow control example . . . . . . . . . . . . 12
Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Interrupt mode operation . . . . . . . . . . . . . . . . 15
Polled mode operation . . . . . . . . . . . . . . . . . . 15
DMA operation . . . . . . . . . . . . . . . . . . . . . . . . 16
Single DMA transfers (DMA mode 0/FIFO
disable) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Block DMA transfers (DMA mode 1). . . . . . . . 17
Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Sleep mode. . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Break and time-out conditions . . . . . . . . . . . . 18
Programmable baud rate generator . . . . . . . . 18
Receiver Holding Register (RHR). . . . . . . . . . 22
Transmit Holding Register (THR) . . . . . . . . . . 22
FIFO Control Register (FCR) . . . . . . . . . . . . . 23
Line Control Register (LCR) . . . . . . . . . . . . . . 24
Line Status Register (LSR) . . . . . . . . . . . . . . . 25
Modem Control Register (MCR) . . . . . . . . . . . 26
Modem Status Register (MSR). . . . . . . . . . . . 27
Interrupt Enable Register (IER) . . . . . . . . . . . 28
Interrupt Identification Register (IIR). . . . . . . . 29
Enhanced Feature Register (EFR) . . . . . . . . . 30
Divisor latches (DLL, DLH) . . . . . . . . . . . . . . . 30
Transmission Control Register (TCR) . . . . . . . 30
Trigger Level Register (TLR). . . . . . . . . . . . . . 31
FIFO ready register. . . . . . . . . . . . . . . . . . . . . 31
5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs
8
9
10
11
11.1
12
13
13.1
13.2
13.3
13.4
13.5
14
15
16
17
18
19
20
© Koninklijke Philips Electronics N.V. 2005
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.
Published in The Netherlands
Programmer’s guide . . . . . . . . . . . . . . . . . . . . 32
Limiting values . . . . . . . . . . . . . . . . . . . . . . . . 34
Static characteristics . . . . . . . . . . . . . . . . . . . 35
Dynamic characteristics . . . . . . . . . . . . . . . . . 36
Package outline . . . . . . . . . . . . . . . . . . . . . . . . 42
Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 46
Revision history . . . . . . . . . . . . . . . . . . . . . . . 47
Data sheet status. . . . . . . . . . . . . . . . . . . . . . . 48
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Contact information . . . . . . . . . . . . . . . . . . . . 48
Timing diagrams. . . . . . . . . . . . . . . . . . . . . . . 37
Introduction to soldering surface mount
packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Reflow soldering. . . . . . . . . . . . . . . . . . . . . . . 44
Wave soldering. . . . . . . . . . . . . . . . . . . . . . . . 44
Manual soldering . . . . . . . . . . . . . . . . . . . . . . 45
Package related soldering information . . . . . . 45
SC68C752B
Date of release: 29 November 2005
Document number: SC68C752B_3