Intel 8XC251SA User Manual Page 126
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8XC251SA, SB, SP, SQ USER’S MANUAL
7-4
Figure 7-3. Port 2 Structure
When port 0 and port 2 are used for an external memory cycle, an internal control signal switches
the output-driver input from the latch output to the internal address/data line. Section 7.8, “Exter-
nal Memory Access,” discusses the operation of port 0 and port 2 as the external address/data bus.
NOTE
Port 0 and port 2 are precluded from use as general purpose I/O ports when
used as address/data bus drivers.
Port 0 internal pullups assist the logic-one output for memory bus cycles only.
Except for these bus cycles, the pullup FET is off. All other port 0 outputs are
open drain.
Read
Latch
Read
Pin
Address
Control
D
CL
Q
Q#
P2.
x
Latch
V
CC
Internal
Pullup
A2240-01
P2.
x
Write to
Latch
Internal
Bus
1
0
- 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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