Intel 8XC251SA User Manual Page 174
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8XC251SA, SB, SP, SQ USER’S MANUAL
10-2
Figure 10-1. Serial Port Block Diagram
Table 10-2. Serial Port Special Function Registers
Mnemonic Description Address
SBUF Serial Buffer. Two separate registers comprise the SBUF register. Writing
to SBUF loads the transmit buffer; reading SBUF accesses the receive
buffer.
99H
SCON Serial Port Control. Selects the serial port operating mode. SCON enables
and disables the receiver, framing bit error detection, multiprocessor
communication, automatic address recognition, and the serial port interrupt
bits.
98H
SADDR Serial Address. Defines the individual address for a slave device. A8H
SADEN Serial Address Enable. Specifies the mask byte that is used to define the
given address for a slave device.
B8H
A4123-02
SBUF
(Receive)
Receive
Shift Register
SBUF
(Transmit)
Read SBUF
Write SBUF
Mode 0
Transmit
TXD
RXD
SCON
TIRI
Interrupt
Request
Serial I/O
Control
IB Bus
Load SBUF
- 8XC251SA, 8XC251SB 1
- 8XC251SP, 8XC251SQ 1
- Embedded Microcontroller 1
- Users Manual 1
- User’s Manual 3
- CONTENTS 5
- Guide to This Manual 19
- CHAPTER 1 21
- GUIDE TO THIS MANUAL 21
- Architectural 31
- Overview 31
- CHAPTER 2 33
- ARCHITECTURAL OVERVIEW 33
- 251 Microcontroller Core 34
- Figure 2-2. The CPU 37
- A2604-02 38
- Address Spaces 41
- CHAPTER 3 43
- ADDRESS SPACES 43
- 51 Architecture 45
- A4133-01 46
- A4385-01 48
- • EA# = 1 51
- Register File 54
- Memory Address Space 54
- • R10 is the B-register 55
- MCS 51 microcontrollers 56
- Table 3-6. Core SFRs 60
- Table 3-7. I/O Port SFRs 60
- Table 3-8. Serial I/O SFRs 61
- Configuration 63
- CHAPTER 4 65
- DEVICE CONFIGURATION 65
- A4237-01 66
- 8 Kbytes 66
- 16 Kbytes 66
- access 71
- A4218-02 74
- Programming 81
- CHAPTER 5 83
- Table 5-1. Data Types 84
- 5.3.1.1 Register Addressing 87
- 5.3.1.2 Immediate 87
- 5.3.1.3 Direct 87
- 5.3.1.4 Indirect 88
- 251 Architecture 89
- 5.3.1.5 Displacement 90
- PROGRAMMING 101
- Interrupt System 103
- CHAPTER 6 105
- INTERRUPT SYSTEM 105
- Interrupt Polling Sequence 106
- Table 6-4. Level of Priority 111
- Response Time = 4 116
- 6.7.2.3 Latency Calculations 117
- Input/Output Ports 121
- CHAPTER 7 123
- INPUT/OUTPUT PORTS 123
- Figure 7-2. Port 0 Structure 125
- Figure 7-3. Port 2 Structure 126
- Timer/Counters and 133
- Watchdog Timer 133
- CHAPTER 8 135
- Interrupt 136
- Overflow 136
- Table 8-2. External Signals 137
- A4112-02 140
- 8.6.2.1 Up Counter Operation 146
- A4114-01 147
- Clock-out Frequency 148
- 4 (65536 - RCAP2H, RCAP2L)× 148
- A4116-02 149
- Programmable 153
- Counter Array 153
- CHAPTER 9 155
- PROGRAMMABLE COUNTER ARRAY 155
- (16 Bits) 157
- for mode 158
- • No operation 159
- A4163-02 160
- A4164-01 162
- A4165-01 164
- A4166-01 165
- A4161-01 166
- Table 9-3. PCA Module Modes 168
- Figure 9-9. CCAPM 169
- Serial I/O Port 171
- CHAPTER 10 173
- SERIAL I/O PORT 173
- A4123-02 174
- Transmit 177
- A2261-01 178
- A4120-01 185
- Minimum Hardware 187
- Figure 11-1. Minimum Setup 189
- MINIMUM HARDWARE SETUP 191
- External 192
- Clock Driver 192
- First ALE 196
- Special Operating 197
- CHAPTER 12 199
- SPECIAL OPERATING MODES 199
- A4160-01 201
- External Memory 207
- Interface 207
- CHAPTER 13 209
- EXTERNAL MEMORY INTERFACE 209
- • The chip is in idle mode 211
- A4230-01 212
- A2809-04 214
- A2813-04 218
- A5009-01 221
- A5008-01 222
- A4228-01 223
- A4219-01 226
- A4220-02 227
- A4148-01 228
- A4147-02 230
- A4169-03 231
- A4221-01 232
- A4151-01 238
- Programming and 239
- Verifying Nonvolatile 239
- CHAPTER 14 241
- PROGRAMMING AND VERIFYING 241
- NONVOLATILE MEMORY 241
- A4122-02 245
- A4129-01 246
- Instruction Set 251
- Reference 251
- APPENDIX A 253
- INSTRUCTION SET REFERENCE 253
- 51 Microcontrollers 256
- 257
- Table A-8. Data Instructions 258
- Table A-10. Bit Instructions 259
- Table A-15. INC/DEC 262
- Table A-17. Shifts 262
- Table A-28. Flag Symbols 278
- IF (A) < #data 294
- IF (A) < dir8 294
- ← (WRj).b 373
- Signal Descriptions 391
- APPENDIX B 393
- SIGNAL DESCRIPTIONS 393
- Registers 401
- APPENDIX C 403
- REGISTERS 403
- Table C-2. Core SFRs 405
- Table C-3. I/O Port SFRs 405
- Table C-4. Serial I/O SFRs 406
- Table C-7. Register File 408
- Glossary 437
- GLOSSARY 439
- Glossary-2 440
- Glossary-3 441
- Glossary-4 442
- Glossary-5 443
- Glossary-6 444
- Glossary-7 445
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