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User’s Manual 51
4.2 Open-Drain Outputs Used for Key Scan
The Parallel Port D outputs can be individually programmed to be open drain. This is use-
ful for scanning a switch matrix, as shown in Figure 4-2. A row is driven low, then the col-
umns are scanned for a low input line, which indicates a key is closed. This is repeated for
each row. The advantage of using open-drain outputs is that if two keys in the same col-
umn are depressed, there will not be a fight between a driver driving the line high and
another driver driving it low.
Figure 4-2. Using Open-Drain Outputs for Key Scan
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- Distributed by: 1
- Microprocessor 2
- Rabbit Semiconductor 3
- Trademarks 3
- TABLE OF CONTENTS 4
- Rabbit 3000 Microprocessor 5
- Chapter 11. Timers 149 6
- User’s Manual 8
- 1. INTRODUCTION 10
- 2 Rabbit 3000 Microprocessor 11
- User’s Manual 3 12
- 4 Rabbit 3000 Microprocessor 13
- User’s Manual 5 14
- 6 Rabbit 3000 Microprocessor 15
- User’s Manual 7 16
- 8 Rabbit 3000 Microprocessor 17
- ABBIT 3000 DESIGN FEATURES 18
- 10 Rabbit 3000 Microprocessor 19
- User’s Manual 11 20
- 12 Rabbit 3000 Microprocessor 21
- User’s Manual 13 22
- 14 Rabbit 3000 Microprocessor 23
- User’s Manual 15 24
- 16 Rabbit 3000 Microprocessor 25
- User’s Manual 17 26
- 2.3 Design Standards 27
- User’s Manual 19 28
- 20 Rabbit 3000 Microprocessor 29
- 3. DETAILS ON RABBIT 30
- MICROPROCESSOR FEATURES 30
- 22 Rabbit 3000 Microprocessor 31
- 3.2 Memory Mapping 32
- 24 Rabbit 3000 Microprocessor 33
- User’s Manual 25 34
- 26 Rabbit 3000 Microprocessor 35
- User’s Manual 27 36
- 28 Rabbit 3000 Microprocessor 37
- User’s Manual 29 38
- 30 Rabbit 3000 Microprocessor 39
- User’s Manual 31 40
- 3.3 Instruction Set Outline 41
- ADD and ADC instructions 45
- ALTD) may be 45
- User’s Manual 39 48
- LD IY,0x4000 48
- SBC instruction the carry 50
- 3.5 Interrupt Structure 53
- IPRES) 54
- IPSET 0 54
- IPSET 1, IPSET 2, IPSET 3) 54
- 4. RABBIT CAPABILITIES 58
- 50 Rabbit 2000 Microprocessor 59
- User’s Manual 51 60
- 4.3 Cold Boot 61
- 4.4 The Slave Port 62
- 54 Rabbit 2000 Microprocessor 63
- IN ASSIGNMENTS AND FUNCTIONS 64
- 5.1 LQFP Package 65
- The same pin dimensions apply 66
- 58 Rabbit 3000 Microprocessor 67
- 5.2 Ball Grid Array Package 68
- (all dimensions in mm) 69
- User’s Manual 61 70
- 5.3 Rabbit Pin Descriptions 71
- User’s Manual 63 72
- 5.4 Bus Timing 73
- User’s Manual 65 74
- 66 Rabbit 3000 Microprocessor 75
- User’s Manual 67 76
- 5.6 DC Characteristics 77
- User’s Manual 69 78
- 70 Rabbit 3000 Microprocessor 79
- ABBIT INTERNAL I/O REGISTERS 80
- 72 Rabbit 3000 Microprocessor 81
- User’s Manual 73 82
- 74 Rabbit 3000 Microprocessor 83
- User’s Manual 75 84
- 76 Rabbit 3000 Microprocessor 85
- User’s Manual 77 86
- 78 Rabbit 3000 Microprocessor 87
- 7. MISCELLANEOUS FUNCTIONS 88
- Main Clock 89
- 82 Rabbit 3000 Microprocessor 91
- 7.3 Clock Doubler 92
- 84 Rabbit 3000 Microprocessor 93
- User’s Manual 85 94
- 7.4 Clock Spectrum Spreader 95
- User’s Manual 87 96
- 88 Rabbit 3000 Microprocessor 97
- User’s Manual 89 98
- 90 Rabbit 3000 Microprocessor 99
- User’s Manual 91 100
- 92 Rabbit 3000 Microprocessor 101
- 7.8 Watchdog Timer 102
- 94 Rabbit 3000 Microprocessor 103
- 7.9 System Reset 104
- User’s Manual 97 106
- 98 Rabbit 3000 Microprocessor 107
- User’s Manual 99 108
- 7.11 Bootstrap Operation 110
- 7.12 Pulse Width Modulator 112
- CPT input 114
- Interrupt 114
- Peri Clock 114
- Timer A8 114
- User’s Manual 107 116
- User’s Manual 109 118
- 7.14 Quadrature Decoder 119
- Rejected 120
- Accepted 120
- Timer A10 120
- User’s Manual 113 122
- EMORY INTERFACE AND MAPPING 124
- Rabbit 3000 125
- DATA LINES (8) 125
- ADDRESS LINES (20) 125
- 8.2 Memory Mapping Overview 126
- 8.3 Memory-Mapping Unit 126
- Table 8-1. Segment Registers 127
- 8.4 Memory Interface Unit 128
- User’s Manual 121 130
- Bit(s) Value Description 132
- 7 0 Normal RST 28 operation 132
- 1 RST 28 is NOP 132
- User’s Manual 125 134
- User’s Manual 127 136
- 9. PARALLEL PORTS 138
- 9.1 Parallel Port A 139
- 9.2 Parallel Port B 140
- 9.3 Parallel Port C 141
- 9.4 Parallel Port D 142
- Driver—optional open drain 143
- User’s Manual 135 144
- 9.5 Parallel Port E 146
- User’s Manual 139 148
- 9.6 Parallel Port F 149
- User’s Manual 141 150
- 9.6.1.1 Summary 151
- 9.7 Parallel Port G 152
- ANK CONTROL REGISTERS 154
- User’s Manual 147 156
- 11. TIMERS 158
- 11.1 Timer A 159
- User’s Manual 151 160
- User’s Manual 153 162
- User’s Manual 155 164
- 11.2 Timer B 165
- User’s Manual 157 166
- 12. RABBIT SERIAL PORTS 170
- User’s Manual 163 172
- User’s Manual 165 174
- 12.2 Serial Port Registers 175
- User’s Manual 167 176
- User’s Manual 169 178
- User’s Manual 171 180
- User’s Manual 173 182
- User’s Manual 175 184
- User’s Manual 177 186
- 12.3 Serial Port Interrupt 188
- User’s Manual 181 190
- 12.6 Clocked Serial Ports 191
- User’s Manual 183 192
- 12.7 Clocked Serial Timing 194
- User’s Manual 187 196
- User’s Manual 189 198
- User’s Manual 191 200
- User’s Manual 195 204
- User’s Manual 197 206
- 13. RABBIT SLAVE PORT 208
- Slave Port Read Cycle 209
- Slave Port Write Cycle 209
- User’s Manual 201 210
- 13.2 Slave Port Registers 213
- User’s Manual 205 214
- User’s Manual 207 216
- Main Oscillator Circuit 218
- 14. RABBIT 3000 CLOCKS 218
- 14.1 Low-Power Design 219
- 15. EMI CONTROL 220
- User’s Manual 213 222
- 16. AC TIMING SPECIFICATIONS 224
- Memory Read (no wait states) 226
- User’s Manual 221 230
- - (data setup time) 231
- = 36.5 ns 231
- 16.2 I/O Access Time 232
- User’s Manual 225 234
- 16.4 Maximum Clock Speeds 236
- Adjust the values of 237
- User’s Manual 229 238
- User’s Manual 231 240
- × f + 5 × V 242
- 0.5 × f in mA 243
- Total Battery Backed 244
- Rabbit 3000 Real-Time Clock 244
- Tiny Logic 32 kHz Osc 244
- SN74HCT1G04DBVR 245
- User’s Manual 237 246
- ABBIT BIOS AND VIRTUAL DRIVER 246
- 17.2 Virtual Driver 247
- User’s Manual 239 248
- 18. OTHER RABBIT SOFTWARE 250
- IOI or IOE) to indicate the 251
- User’s Manual 243 252
- 18.4 Timer and Clock Usage 253
- User’s Manual 245 254
- 19. RABBIT INSTRUCTIONS 256
- Spreadsheet Conventions 257
- User’s Manual 249 258
- 19.1 Load Immediate Data 259
- User’s Manual 251 260
- 19.7 Exchange Instructions 261
- User’s Manual 253 262
- User’s Manual 255 264
- 19.15 Instruction Prefixes 265
- User’s Manual 257 266
- INSTRUCTIONS 268
- WITH BINARY ENCODING 270
- Rabbit Z180 Meaning 271
- User’s Manual 263 272
- User’s Manual 265 274
- User’s Manual 267 276
- APPENDIX A 278
- THE RABBIT PROGRAMMING PORT 278
- Programming Port 278
- Pin Numbers 278
- User’s Manual 271 280
- User’s Manual 273 282
- User’s Manual 275 284
- User’s Manual 277 286
- User’s Manual 279 288
- User’s Manual 281 290
- User’s Manual 283 292
- User’s Manual 285 294
- User’s Manual 287 296
- User’s Manual 289 298
- User’s Manual 291 300
- User’s Manual 293 302
- User’s Manual 295 304
- User’s Manual 297 306
- User’s Manual 299 308
- User’s Manual 301 310
- User’s Manual 303 312
- User’s Manual 305 314
- User’s Manual 307 316
- User’s Manual 309 318
- User’s Manual 311 320
- User’s Manual 313 322
- User’s Manual 315 324
- APPENDIX C. SYSTEM/USER MODE 326
- C.1 System/User Mode Opcodes 327
- User’s Manual 319 328
- User’s Manual 321 330
- User’s Manual 323 332
- System Mode User Mode 333
- User’s Manual 325 334
- APPENDIX D 336
- User’s Manual 329 338
- User’s Manual 331 340
- User’s Manual 333 342
- NOTICE TO USERS 344
- User’s Manual 337 346
- User’s Manual 339 348
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