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8XC251SA, 8XC251SB, 8XC251SP, 8XC251SQ
Embedded Microcontroller Users Manual
27279502.qxd 6/18/96 9:25 AM Page 1
8XC251SA, 8XC251SB,
8XC251SP, 8XC251SQ
Embedded Microcontroller
Users Manual
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8XC251SA, 8XC251SB, 8XC251SP, 8XC251SQ Embedded Microcontroller User’s Manual May 1996 Order Number 272795-002
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Information in this document is provided in connection with Intel products. Intel assumes no liability whatsoever, including in- fringement of any patent or copyright, for sale and use of Intel products except as provided in Intel’s Terms and Conditions of Sale for such products. Intel retains the right to make changes to these specifications at any time, without notice. Microcontroller products may have minor variations to this specification known as errata. *Other brands and names are the pro
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CONTENTS CHAPTER 1 GUIDE TO THIS MANUAL 1.1 MANUAL CONTENTS ................................................................................................... 1-1 1.2 NOTATIONAL CONVENTIONS AND TERMINOLOGY ................................................ 1-3 1.3 RELATED DOCUMENTS .............................................................................................. 1-5 1.3.1 Data Sheet ......................................................................................................
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8XC251SA, SB, SP, SQ USER’S MANUAL 3.3.2.3 Extended Stack Pointer, SPX ............................................................................3-15 3.4 SPECIAL FUNCTION REGISTERS (SFRS) ............................................................... 3-16 CHAPTER 4 DEVICE CONFIGURATION 4.1 CONFIGURATION OVERVIEW .................................................................................... 4-1 4.2 DEVICE CONFIGURATION .....................................................................
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CONTENTS 5.4 BIT INSTRUCTIONS ................................................................................................... 5-11 5.4.1 Bit Addressing .........................................................................................................5-11 5.5 CONTROL INSTRUCTIONS ....................................................................................... 5-12 5.5.1 Addressing Modes for Control Instructions .............................................................5-13 5.
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8XC251SA, SB, SP, SQ USER’S MANUAL 8.2 TIMER/COUNTER OPERATION................................................................................... 8-1 8.3 TIMER 0......................................................................................................................... 8-3 8.3.1 Mode 0 (13-bit Timer) ...............................................................................................8-4 8.3.2 Mode 1 (16-bit Timer) ..........................................................
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CONTENTS 10.2 MODES OF OPERATION............................................................................................ 10-4 10.2.1 Synchronous Mode (Mode 0) ..................................................................................10-4 10.2.1.1 Transmission (Mode 0) ......................................................................................10-4 10.2.1.2 Reception (Mode 0) ............................................................................................10-5 10.
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8XC251SA, SB, SP, SQ USER’S MANUAL 12.2.2 Power Off Flag ........................................................................................................12-1 12.3 IDLE MODE ................................................................................................................. 12-4 12.3.1 Entering Idle Mode ..................................................................................................12-4 12.3.2 Exiting Idle Mode ..............................................
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CONTENTS CHAPTER 14 PROGRAMMING AND VERIFYING NONVOLATILE MEMORY 14.1 GENERAL.................................................................................................................... 14-1 14.1.1 Programming Considerations for On-chip Code Memory .......................................14-2 14.1.2 EPROM Devices .....................................................................................................14-3 14.2 PROGRAMMING AND VERIFYING MODES....................................
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8XC251SA, SB, SP, SQ USER’S MANUAL FIGURES Figure Page 2-1 Functional Block Diagram of the 8XC251SA, SB, SP, SQ...........................................2-2 2-2 The CPU.......................................................................................................................2-5 2-3 Clocking Definitions......................................................................................................2-6 3-1 Address Spaces for MCS® 251 Microcontrollers .............................
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CONTENTS FIGURES Figure Page 8-12 T2CON: Timer 2 Control Register ..............................................................................8-17 9-1 Programmable Counter Array.......................................................................................9-3 9-2 PCA 16-bit Capture Mode ............................................................................................9-6 9-3 PCA Software Timer and High-speed Output Modes...................................................9-8 9
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8XC251SA, SB, SP, SQ USER’S MANUAL FIGURES Figure Page 13-23 Bus Diagram for Example 4: 87C251SB/83C251SB in Nonpage Mode ..................13-24 13-24 Address Space for Example 4..................................................................................13-25 13-25 Bus Diagram for Example 5: 80C251SB in Nonpage Mode.....................................13-27 13-26 Address Space for Examples 5 and 6 ......................................................................13-28 13-27 Bus Diagra
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CONTENTS TABLES Table Page 1-1 Intel Application Support Services................................................................................1-7 2-1 8XC251SA, SB, SP, SQ Features................................................................................2-3 3-1 Address Mappings........................................................................................................3-4 3-2 Minimum Times to Fetch Two Bytes of Code..............................................................
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8XC251SA, SB, SP, SQ USER’S MANUAL TABLES Table Page 10-4 Timer 1 Generated Baud Rates for Serial I/O Modes 1 and 3..................................10-12 10-5 Selecting the Baud Rate Generator(s) .....................................................................10-13 10-6 Timer 2 Generated Baud Rates ...............................................................................10-14 12-1 Pin Conditions in Various Modes.........................................................................
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CONTENTS TABLES Table Page C-4 Serial I/O SFRs ...........................................................................................................C-4 C-5 Timer/Counter and Watchdog Timer SFRs .................................................................C-4 C-6 Programmable Counter Array (PCA) SFRs.................................................................C-5 C-7 Register File .......................................................................................................
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1 Guide to This Manual
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