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273138-002 December 2003 v

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

Intel 8XC251SA Hardware Description

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