sc68c2550b NXP Semiconductors, sc68c2550b Datasheet - Page 35

• Manufacturer Part Number: sc68c2550b
• Description: Sc68c2550b 5 V, 3.3 V And 2.5 V Dual Uart, 5 Mbit/s Max. , With 16-byte Fifos And Motorola Up Interface
• Manufacturer: NXP Semiconductors

Philips Semiconductors
20. Contents
1
2
3
4
5
5.1
5.2
6
6.1
6.2
6.3
6.4
6.5
6.6
6.7
7
7.1
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
General description . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Ordering information . . . . . . . . . . . . . . . . . . . . . 2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pinning information . . . . . . . . . . . . . . . . . . . . . . 4
Functional description . . . . . . . . . . . . . . . . . . . 7
Register descriptions . . . . . . . . . . . . . . . . . . . 13
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 22
Static characteristics. . . . . . . . . . . . . . . . . . . . 23
Dynamic characteristics . . . . . . . . . . . . . . . . . 24
Package outline . . . . . . . . . . . . . . . . . . . . . . . . 30
Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4
UART A-B functions . . . . . . . . . . . . . . . . . . . . . 7
Internal registers. . . . . . . . . . . . . . . . . . . . . . . . 8
FIFO operation . . . . . . . . . . . . . . . . . . . . . . . . . 8
Hardware/software and time-out interrupts. . . . 9
Programmable baud rate generator . . . . . . . . . 9
DMA operation . . . . . . . . . . . . . . . . . . . . . . . . 10
Loop-back mode . . . . . . . . . . . . . . . . . . . . . . . 11
Transmit (THR) and Receive (RHR) Holding
Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Interrupt Enable Register (IER) . . . . . . . . . . . 14
IER versus Transmit/Receive FIFO interrupt mode
operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
IER versus Receive/Transmit FIFO polled mode
operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
FIFO Control Register (FCR) . . . . . . . . . . . . . 15
DMA mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Mode 0 (FCR bit 3 = 0) . . . . . . . . . . . . . . . . . . 15
Mode 1 (FCR bit 3 = 1) . . . . . . . . . . . . . . . . . . 15
FIFO mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Interrupt Status Register (ISR) . . . . . . . . . . . . 17
Line Control Register (LCR) . . . . . . . . . . . . . . 18
Modem Control Register (MCR) . . . . . . . . . . . 19
Line Status Register (LSR) . . . . . . . . . . . . . . . 20
Modem Status Register (MSR). . . . . . . . . . . . 21
Scratchpad Register (SPR) . . . . . . . . . . . . . . 22
SC68C2550B external reset condition . . . . . . 22
Timing diagrams . . . . . . . . . . . . . . . . . . . . . . . 25
Introduction to soldering surface mount packages
31
Reflow soldering . . . . . . . . . . . . . . . . . . . . . . . 31
Wave soldering . . . . . . . . . . . . . . . . . . . . . . . . 31
Manual soldering . . . . . . . . . . . . . . . . . . . . . . 32
5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 16-byte FIFOs
12.5
13
14
15
16
17
18
19
© 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
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 33
Revision history . . . . . . . . . . . . . . . . . . . . . . . 33
Data sheet status. . . . . . . . . . . . . . . . . . . . . . . 34
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Contact information . . . . . . . . . . . . . . . . . . . . 34
Package related soldering information . . . . . . 32
SC68C2550B
Document number: 9397 750 14941
Date of release: 28 April 2005