Intel 8xC251TB, 8xC251TQ, 8XC251SQ, 8XC251SB, 8XC251SP User Manual
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8xC251TB, 8xC2 51TQ,
Hardware Description
Addendum to the 8xC251SA, 8xC251SB,
8xC251SP, 8xC251S Q, User’s Manual
Release Date: December 2003
Order Number: 273138-002
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8xC251Tx Hardware Description
REVISION HISTORY:
Date Revision Description
November 1997 001 Initial release of t his document
December 2003 002 Removed references to 8XC251TA, 8XC251TP
273138-002 December 2003 iii
8xC251Tx Hardware Description
iv December 2003 273138-002
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 Dat a 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 S pe c ia l F unc tion Regis te r D e fin it i o ns ................. .. ... ......... ... .......... .. .... 10
Table 8. IE1 Spec ia l F unc tion Regist e r D ef in itions... .......... .. .......... .. ... ......... ... .......... .. .... 11
Table 9. IPH1 Spe c ia l F unc tion Regist e r D ef in it io n s ............ .. ... .......... .. .......... .. .......... .. .. 11
Table 10. IPL1 Spe c ia l Fun c tio n R eg i st er De f in itions. .......... .. .......... .. ... ......... ... .......... .. .... 11
Table 11. Interru p t P rio r it y of Se c o nd S er ia l 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
273138-002 December 2003 v
8xC251 Tx Hardware Description
vi December 2003 273138-002
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