80C186EB/80C188EB Microprocessor User's Manual - CEUNES

More documents

Recommendations

Info

CHAPTER 11INPUT/OUTPUT PORTSMany applications do not require full use of all the on-chip peripheral functions. For example, theChip-Select Unit provides a total of ten chip-select lines; only a large design would require allten. For smaller designs that require fewer than ten chip-selects, these pins would be wasted.The input/output ports give system designers the flexibility to replace the functions of unused peripheralpins with general-purpose I/O ports. Many of the on-chip peripheral pin functions aremultiplexed with an I/O port. If a particular peripheral pin function is unnecessary in an application,that pin can be used for I/O. The <strong>80C186EB</strong>/<strong>80C188EB</strong> has four types of ports: bidirectional,input-only, output-only, and open-drain bidirectional.11.1 FUNCTIONAL OVERVIEWAll port pin types are derived from a common bidirectional port logic module. Unidirectional andopen-drain ports are a subset of the bidirectional module. The following sections describe eachport type. The bidirectional port is described in detail, as it is the basis for all of the other porttypes. The descriptions for the unidirectional and open-drain ports only highlight their specificdifferences from the common bidirectional module.11.1.1 Bidirectional PortFigure 11-1 shows a simplified schematic of a bidirectional port pin. The overall function of abidirectional port pin is controlled by the state of the Port Control Latch. The output of the PortControl Latch selects the source of output data and the source of the control signal for the threestateoutput driver. When the port is programmed to act as a peripheral pin, both the data for thepin and the directional control signal for the pin come from the associated integrated peripheral.When a bidirectional port pin is programmed as an I/O port, all port parameters are under softwarecontrol.The output of the Port Direction latch enables (or disables) the three-state output driver when thepin is programmed as an I/O port. The three-state output driver is enabled by clearing the PortDirection latch. The data driven on an output port pin is held in the Port Data latch. Setting thePort Direction latch disables the three-state output driver, making the pin an input.The signal present on the device pin is routed through a synchronizer to a three-state latch thatconnects to the internal data bus. The state of the pin can be read at any time, regardless of whetherthe pin is used as an I/O port or for a peripheral function.11-1
INPUT/OUTPUT PORTSFrom IntegratedPeripheralRead PortData latchPort/PeripheralData MultiplexerI0Output DriverWrite PortData LatchRead PortPin StateRead PortDirection ControlQDQPort Data LatchI1SQSYNCPinInternal DataBus (F-Bus)Write PortDirectionRead PortDirectionQDQPort Direction LatchI0I1SQDQWrite PortControlTo IntegratedPeripheralQPort Control LatchPeripheralDirection ControlA1247-0AFigure 11-1. Simplified Logic Diagram of a Bidirectional Port Pin11-2
Page 1 and 2:
80C186EB/80C188EBMicroprocessorUser
Page 3 and 4:
Information in this document is pro
Page 5 and 6:
CONTENTS2.3.2 Software Interrupts .
Page 7 and 8:
CONTENTS6.4.4 Enabling and Disablin
Page 9 and 10:
CONTENTS10.2.2 Asynchronous Mode Pr
Page 11 and 12:
CONTENTSFIGURESFigurePage2-1 Simpli
Page 13 and 14:
CONTENTSFIGURESFigurePage6-9 Using
Page 15 and 16:
CONTENTSTableTABLESPage1-1 Comparis
Page 17 and 18:
CONTENTSEXAMPLESExamplePage5-1 Init
Page 20 and 21:
CHAPTER 1INTRODUCTIONThe 8086 micro
Page 22 and 23:
INTRODUCTIONEach chapter covers a s
Page 24 and 25:
INTRODUCTION1.3.1 How to Use Intel'
Page 26:
Overview of the80C186 FamilyArchite
Page 29 and 30:
OVERVIEW OF THE 80C186 FAMILY ARCHI
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Page 39:
Page 42 and 43:
Page 44 and 45:
Page 46 and 47:
Page 48 and 49:
Page 50 and 51:
Page 52 and 53:
Page 54 and 55:
Page 56 and 57:
Page 58 and 59:
Page 60 and 61:
Page 62 and 63:
Page 64 and 65:
Page 66 and 67:
Page 68 and 69:
Page 70 and 71:
Page 72 and 73:
Page 74 and 75:
Page 76 and 77:
Page 78:
Bus Interface Unit3
Page 81 and 82:
BUS INTERFACE UNITPhysical Implemen
Page 83 and 84:
BUS INTERFACE UNIT(X + 1)(X)A19:1 D
Page 85 and 86:
BUS INTERFACE UNITFor word transfer
Page 87 and 88:
BUS INTERFACE UNITCLKOUTT4 T1 T2 T3
Page 89 and 90:
BUS INTERFACE UNITCLKOUTT4or TI T1
Page 91 and 92:
BUS INTERFACE UNITSignals From CPU4
Page 93 and 94:
BUS INTERFACE UNITT2T3or TWT4or TIC
Page 95 and 96:
BUS INTERFACE UNITA normally not-re
Page 97 and 98:
BUS INTERFACE UNITT2or T3or TWT3or
Page 99 and 100:
BUS INTERFACE UNITAn idle bus state
Page 101 and 102:
BUS INTERFACE UNIT3.5.1.1 Refresh B
Page 103 and 104:
BUS INTERFACE UNITMost memory and p
Page 105 and 106:
BUS INTERFACE UNITCLKOUTT4 T2 T3 TI
Page 107 and 108:
BUS INTERFACE UNIT3.5.4 HALT Bus Cy
Page 109 and 110:
BUS INTERFACE UNITCLKOUTT1 TI TIALE
Page 111 and 112:
BUS INTERFACE UNITCLKOUTALES2:0AD15
Page 113 and 114:
BUS INTERFACE UNITCLKOUTNMI/INTxNot
Page 115 and 116:
BUS INTERFACE UNITALEProcessorA19:1
Page 117 and 118:
BUS INTERFACE UNITThe WAIT instruct
Page 119 and 120:
BUS INTERFACE UNITCLKOUTHOLD124HLDA
Page 121 and 122:
BUS INTERFACE UNITCLKOUT1 3 4HOLDHL
Page 123 and 124:
BUS INTERFACE UNITCLKOUTHOLD12345HL
Page 126:
Peripheral ControlBlock4
Page 129 and 130:
PERIPHERAL CONTROL BLOCKRegister Na
Page 131 and 132:
PERIPHERAL CONTROL BLOCK4.3 RESERVE
Page 133 and 134:
PERIPHERAL CONTROL BLOCK4.4.3.1 Wri
Page 135 and 136:
PERIPHERAL CONTROL BLOCK4-8
Page 138 and 139:
CHAPTER 5CLOCK GENERATION AND POWER
Page 140 and 141:
CLOCK GENERATION AND POWER MANAGEME
Page 142 and 143:
Page 144 and 145:
Page 146 and 147:
Page 148 and 149:
Page 150 and 151:
Page 152 and 153:
Page 154 and 155:
Page 156 and 157:
Page 158:
Chip-Select Unit6
Page 161 and 162:
CHIP-SELECT UNIT27C25674AC138A1:13A
Page 163 and 164:
CHIP-SELECT UNITT4 T1 T2 T3T4CLKOUT
Page 165 and 166:
CHIP-SELECT UNITThe START register
Page 167 and 168:
CHIP-SELECT UNITRegister Name:Regis
Page 169 and 170:
CHIP-SELECT UNIT6.4.2 Start Address
Page 171 and 172:
CHIP-SELECT UNITBUS READYREADY Cont
Page 173 and 174:
CHIP-SELECT UNITTable 6-3 lists exa
Page 175 and 176:
CHIP-SELECT UNITREADYALEA19:16AD15:
Page 177 and 178:
CHIP-SELECT UNITDRAM_BASEEQU 128 ;W
Page 179 and 180:
CHIP-SELECT UNIT; DATA SEGMENTDATAS
Page 182 and 183:
CHAPTER 7REFRESH CONTROL UNITThe Re
Page 184 and 185:
REFRESH CONTROL UNITRefresh Control
Page 186 and 187:
REFRESH CONTROL UNIT7.5 REFRESH BUS
Page 188 and 189:
REFRESH CONTROL UNIT7.7 PROGRAMMING
Page 190 and 191:
REFRESH CONTROL UNITRegister Name:R
Page 192 and 193:
REFRESH CONTROL UNITRegister Name:R
Page 194 and 195:
REFRESH CONTROL UNITmov dx, RFBASEm
Page 196:
Interrupt ControlUnit8
Page 199 and 200:
INTERRUPT CONTROL UNITTimer 0 Timer
Page 201 and 202:
INTERRUPT CONTROL UNITInterrupt sou
Page 203 and 204:
INTERRUPT CONTROL UNIT8.2.2.1 Prior
Page 205 and 206:
INTERRUPT CONTROL UNITINTINT08259Ao
Page 207 and 208:
INTERRUPT CONTROL UNIT8.2.6 Edge an
Page 209 and 210:
INTERRUPT CONTROL UNITTable 8-3. In
Page 211 and 212:
INTERRUPT CONTROL UNIT.Register Nam
Page 213 and 214:
INTERRUPT CONTROL UNIT8.3.2 Interru
Page 215 and 216:
INTERRUPT CONTROL UNIT8.3.4 Priorit
Page 217 and 218:
INTERRUPT CONTROL UNITReading the P
Page 219 and 220:
INTERRUPT CONTROL UNITRegister Name
Page 221 and 222:
INTERRUPT CONTROL UNIT3. Program th
Page 224 and 225:
CHAPTER 9TIMER/COUNTER UNITThe Time
Page 226 and 227:
TIMER/COUNTER UNITTimer 0 Timer 1 T
Page 228 and 229:
TIMER/COUNTER UNITContinued From"A"
Page 230 and 231:
TIMER/COUNTER UNITRegister Name:Reg
Page 232 and 233:
Page 234 and 235:
Page 236 and 237: TIMER/COUNTER UNITThe timer countin
Page 238 and 239: TIMER/COUNTER UNITTimer 0Serviced1I
Page 240 and 241: TIMER/COUNTER UNIT9.3.2 Synchroniza
Page 242 and 243: TIMER/COUNTER UNITlib_80186 segment
Page 244 and 245: TIMER/COUNTER UNIT$mod186nameexampl
Page 246 and 247: TIMER/COUNTER UNIT_CMPB equ word pt
Page 248: SerialCommunicationsUnit10
Page 251 and 252: SERIAL COMMUNICATIONS UNIT1 2 3 4 5
Page 253 and 254: SERIAL COMMUNICATIONS UNITThe RX ma
Page 255 and 256: SERIAL COMMUNICATIONS UNITThe Trans
Page 257 and 258: SERIAL COMMUNICATIONS UNIT5. At the
Page 259 and 260: SERIAL COMMUNICATIONS UNITRegister
Page 261 and 262: SERIAL COMMUNICATIONS UNITRegister
Page 263 and 264: SERIAL COMMUNICATIONS UNIT3. If the
Page 265 and 266: SERIAL COMMUNICATIONS UNITThe seria
Page 267 and 268: SERIAL COMMUNICATIONS UNIT10.2.3 Pr
Page 269 and 270: SERIAL COMMUNICATIONS UNITBCLK is a
Page 271 and 272: SERIAL COMMUNICATIONS UNITChannel_0
Page 273 and 274: SERIAL COMMUNICATIONS UNITmovmovmov
Page 275 and 276: SERIAL COMMUNICATIONS UNIT10.5.2 Mo
Page 277 and 278: SERIAL COMMUNICATIONS UNITMASTER186
Page 279 and 280: SERIAL COMMUNICATIONS UNIT$mod186na
Page 281 and 282: SERIAL COMMUNICATIONS UNIT$mod186na
Page 283 and 284: SERIAL COMMUNICATIONS UNITcmp al, F
Page 285 and 286: SERIAL COMMUNICATIONS UNIT10-36
Page 290 and 291: INPUT/OUTPUT PORTS11.1.2 Input Port
Page 292 and 293: INPUT/OUTPUT PORTSFrom IntegratedPe
Page 294 and 295: INPUT/OUTPUT PORTS11.1.5.1 Port 1 O
Page 296 and 297: INPUT/OUTPUT PORTSRegister Name:Reg
Page 298 and 299: INPUT/OUTPUT PORTSRegister Name:Reg
Page 300: Math Coprocessing12
Page 303 and 304: MATH COPROCESSING12.3 THE 80C187 MA
Page 305 and 306: MATH COPROCESSINGAvailable data typ
Page 307 and 308: MATH COPROCESSING12.3.1.5 Constant
Page 309 and 310: MATH COPROCESSINGIncreasing Signifi
Page 311 and 312: MATH COPROCESSING12.4.1 Clocking th
Page 313 and 314: MATH COPROCESSINGExternalOscillator
Page 315 and 316: MATH COPROCESSING80C186Modular Core
Page 317 and 318: MATH COPROCESSING$mod186$modc187nam
Page 320 and 321: CHAPTER 13ONCE MODEONCE (pronounced
Page 322: 80C186 InstructionSet Additions and
Page 325 and 326: 80C186 INSTRUCTION SET ADDITIONS AN
Page 336 and 337: APPENDIX BINPUT SYNCHRONIZATIONMany
Page 338:
Instruction SetDescriptionsC
Page 341 and 342:
INSTRUCTION SET DESCRIPTIONSTable C
Page 343 and 344:
Page 345 and 346:
Page 347 and 348:
Page 349 and 350:
Page 351 and 352:
Page 353 and 354:
Page 355 and 356:
Page 357 and 358:
INSTRUCTION SET DESCRIPTIONSINCINST
Page 359 and 360:
Page 361 and 362:
Page 363 and 364:
Page 365 and 366:
Page 367 and 368:
Page 369 and 370:
Page 371 and 372:
INSTRUCTION SET DESCRIPTIONSOROUTTa
Page 373 and 374:
Page 375 and 376:
Page 377 and 378:
Page 379 and 380:
Page 381 and 382:
Page 383 and 384:
Page 385 and 386:
Page 387 and 388:
INSTRUCTION SET DESCRIPTIONSC-48
Page 390 and 391:
APPENDIX DINSTRUCTION SET OPCODESAN
Page 392 and 393:
INSTRUCTION SET OPCODES AND CLOCK C
Page 394 and 395:
Page 396 and 397:
Page 398 and 399:
Page 400 and 401:
Page 402 and 403:
Page 404 and 405:
Page 406 and 407:
Page 408 and 409:
Page 410 and 411:
Page 412:
Index
Page 415 and 416:
INDEXand T-states, 3-9data phase, 3
Page 417 and 418:
INDEXarithmetic instructions, 2-19-
Page 419 and 420:
INDEXblock diagram, 3-15implementat
Page 421:
INDEXWWait statesand bus cycles, 3-
show all

80C186EB/80C188EB Microprocessor User's Manual - CEUNES

Create successful ePaper yourself

Delete template?

Save as template?