Intel 8xC251TB, 8xC251TQ, 8XC251SQ, 8XC251SB, 8XC251SP, 8XC251SA User Manual

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8xC251TB, 8xC251TQ, Hardware Description

Addendum to the 8xC251SA, 8xC251SB, 8xC251SP, 8xC251SQ, User’s Manual

Release Date: December 2003

Order Number: 273138-002

The 8xC251Tx may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Such errata are not covered by Intel's warranty. Current characterized errata are available on request.

Information in this document is provided in connection with Intel products. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Intel's Terms and Conditions of Sale for such products, Intel assumes no liability whatsoever, and Intel disclaims any express or implied warranty, relating to sale and/or use of Intel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. Intel products are not intended for use in medical, life saving, or life sustaining applications. Intel may make changes to specifications and product descriptions at any time, without notice. Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order.

Designers must not rely on the absence or characteristics of any features or instructions marked "reserved" or "undefined." Intel reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them.

The 8xC251Tx may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Current characterized errata are available on request.

Copies of documents which have an ordering number and are referenced in this document, or other Intel literature, may be obtained from:

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Copyright © Intel Corporation 1997, 2003.

*Third party brands and names are the property of their respective owners.

 

 

8xC251Tx Hardware Description

REVISION HISTORY:

 

 

 

 

 

Date

Revision

Description

 

 

 

November 1997

001

Initial release of this document

 

 

 

December 2003

002

Removed references to 8XC251TA, 8XC251TP

 

 

 

273138-002

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8xC251Tx Hardware Description

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8xC251Tx Hardware Description

8xC251TB, 8xC251TQ Hardware Description

Addendum to the 8xC251SA, 8xC251SB, 8xC251SP, 8xC251SQ, User’s Manual

1.0

INTRODUCTION TO THE 8xC251Tx

 

1.1

Comparing the 8xC251Tx and 8xC251Sx .....................................................................

1

2.0

SIGNAL SUMMARY

 

3.0

THE SECOND SERIAL I/O PORT

 

3.1

Overview........................................................................................................................

7

3.2

Special Function Register Definitions ............................................................................

9

3.2.1

SCON1 ....................................................................................................................

9

3.2.2

SBUF1 ...................................................................................................................

10

3.2.3

SADDR1 ................................................................................................................

10

3.2.4

SADEN1 ................................................................................................................

10

3.2.5

BGCON ..................................................................................................................

10

3.2.6

IE1 .........................................................................................................................

11

3.2.7

IPH1 .......................................................................................................................

11

3.2.8

IPL1 .......................................................................................................................

11

4.0 EXTENDED DATA FLOAT TIMING

 

4.1

Summary of the Extended Data Float Timing Changes ..............................................

12

FIGURES

 

Figure 1

8xC251Tx Block Diagram .....................................................................................

1

TABLES

 

 

Table 1.

8xC251Tx Signal Summary .................................................................................

2

Table 2.

8xC251Tx Signal Descriptions .............................................................................

3

Table 3.

Special Function Register (SFR) Map..................................................................

6

Table 4.

Second Serial I/O Port Signals ............................................................................

7

Table 5.

Second Serial I/O Port Special Function Registers..............................................

8

Table 6.

SCON1 Special Function Register Definitions .....................................................

9

Table 7.

BGCON Special Function Register Definitions ..................................................

10

Table 8.

IE1 Special Function Register Definitions ..........................................................

11

Table 9.

IPH1 Special Function Register Definitions .......................................................

11

Table 10.

IPL1 Special Function Register Definitions ........................................................

11

Table 11.

Interrupt Priority of Second Serial I/O Port.........................................................

11

Table 12.

UCONFIG1 bit definitions for the 8xC251Tx ......................................................

12

Table 13.

Summary of the EDF# and WSB#[1:0] Configuration Options...........................

13

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