80C186EC/80C188EC Microprocessor User's Manual

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MATH COPROCESSING 14.4.4 Exception Trapping The 80C187 detects six error conditions that can occur during instruction execution. The 80C187 can apply default fix-ups or signal exceptions to the microprocessor’s ERROR pin. The processor tests ERROR at the beginning of numerics instructions, so it traps an exception on the next attempted numerics instruction after it occurs. When ERROR tests active, the processor executes a Type 16 interrupt. There is no automatic exception-trapping on the last numerics instruction of a series. If the last numerics instruction writes an invalid result to memory, subsequent non-numerics instructions can use that result as if it is valid, further compounding the original error. Insert the FNOP instruction at the end of the 80C187 routine to force an ERROR check. If the program is written in a high-level language, it is impossible to insert FNOP. In this case, route the error signal through an inverter to an interrupt pin on the microprocessor (see Figure 14-4). With this arrangement, use a flip-flop to latch BUSY upon assertion of ERROR. The latch gets cleared during the exception-handler routine. Use an additional flip-flop to latch PEREQ to maintain the correct handshaking sequence with the microprocessor. 14.5 EXAMPLE MATH COPROCESSOR ROUTINES Example 14-1 shows the initialization sequence for the 80C187. Example 14-2 is an example of a floating point routine using the 80C187. The FSINCOS instruction yields both sine and cosine in one operation. 14-13
MATH COPROCESSING 80C186 Modular Core ERROR RESOUT CSx Latch INTx BUSY A D D R E S S A19:0 EN A2 A1 ALE A19:A16 AD15:0 D15:0 CMD1 CLKOUT CMD0 NPRD 80C187 NPS1 CKM D15:0 PEREQ NCS RD WR CLK NPWR PEREQ D D C '74 S C '74 Q Q Q BUSY S NPS2 ERROR RESET A1256-01 Figure 14-4. 80C187 Exception Trapping via Processor Interrupt Pin 14-14
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80C186EC/80C188EC Microprocessor Us
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Information in this document is pro
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CONTENTS 2.3 INTERRUPTS AND EXCEPTI
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CONTENTS 6.4 PROGRAMMING...........
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CONTENTS CHAPTER 9 TIMER/COUNTER UN
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CONTENTS 11.4 SERIAL COMMUNICATIONS
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CONTENTS FIGURES Figure Page 2-1 Si
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CONTENTS FIGURES Figure Page 6-6 ST
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CONTENTS FIGURES Figure Page 11-18
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CONTENTS Table TABLES Page C-1 Inst
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Introduction 1
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INTRODUCTION The 80C186 Modular Cor
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INTRODUCTION Table 1-2. Related Doc
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INTRODUCTION 1.3.2.1 How to Find Ap
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Overview of the 80C186 Family Archi
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OVERVIEW OF THE 80C186 FAMILY ARCHI
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Bus Interface Unit 3
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BUS INTERFACE UNIT Physical Impleme
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BUS INTERFACE UNIT (X + 1) (X) A19:
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BUS INTERFACE UNIT For word transfe
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BUS INTERFACE UNIT CLKOUT T4 T1 T2
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BUS INTERFACE UNIT CLKOUT T4 or TI
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BUS INTERFACE UNIT Signals From CPU
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BUS INTERFACE UNIT T2 T3 or TW T4 o
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BUS INTERFACE UNIT A normally not-r
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BUS INTERFACE UNIT T2 or T3 or TW T
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BUS INTERFACE UNIT An idle bus stat
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BUS INTERFACE UNIT T1 T2 T3 T4 CLKO
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BUS INTERFACE UNIT T1 T2 T3 T4 CLKO
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BUS INTERFACE UNIT The minimum devi
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BUS INTERFACE UNIT Figure 3-24 show
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BUS INTERFACE UNIT After several TI
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BUS INTERFACE UNIT 3.5.5 Temporaril
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BUS INTERFACE UNIT CLKOUT ALE T4 T1
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BUS INTERFACE UNIT CLKOUT NMI/NTx N
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BUS INTERFACE UNIT ALE Processor A1
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BUS INTERFACE UNIT The WAIT instruc
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BUS INTERFACE UNIT CLKOUT HOLD 1 2
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BUS INTERFACE UNIT CLKOUT 1 3 4 HOL
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BUS INTERFACE UNIT CLKOUT HOLD 1 2
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Peripheral Control Block 4
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PERIPHERAL CONTROL BLOCK Register N
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PERIPHERAL CONTROL BLOCK 4.3 RESERV
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PERIPHERAL CONTROL BLOCK 4.4.3.1 Wr
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Clock Generation and Power Manageme
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CLOCK GENERATION AND POWER MANAGEME
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CHAPTER 6 CHIP-SELECT UNIT Every sy
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CHIP-SELECT UNIT Stop Value Ignore
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CHIP-SELECT UNIT Address 1 Ready Fl
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CHIP-SELECT UNIT Register Name: Reg
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CHIP-SELECT UNIT Register Name: Reg
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CHIP-SELECT UNIT In the previous eq
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CHIP-SELECT UNIT No Any READY = 1 W
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CHIP-SELECT UNIT The GCS chip-selec
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CHIP-SELECT UNIT $ TITLE (Chip-Sele
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CHIP-SELECT UNIT ;SET UP CHIP SELEC
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Refresh Control Unit 7
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REFRESH CONTROL UNIT 7.1 THE ROLE O
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REFRESH CONTROL UNIT The BIU does n
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REFRESH CONTROL UNIT CLKOUT T4 T1 T
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REFRESH CONTROL UNIT 7.7.2.1 Refres
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REFRESH CONTROL UNIT Register Name:
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REFRESH CONTROL UNIT $mod186 name e
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REFRESH CONTROL UNIT T1 T1 T1 T1 T1
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CHAPTER 8 INTERRUPT CONTROL UNIT Th
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INTERRUPT CONTROL UNIT Polling requ
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INTERRUPT CONTROL UNIT INT INTA D7:
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INTERRUPT CONTROL UNIT Edge Sense L
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INTERRUPT CONTROL UNIT 8.3.2 Interr
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INTERRUPT CONTROL UNIT 8.3.3.1 Defa
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INTERRUPT CONTROL UNIT More than on
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INTERRUPT CONTROL UNIT IR0 IR1 IR2
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INTERRUPT CONTROL UNIT 10. On the s
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INTERRUPT CONTROL UNIT 8.3.7 Altern
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INTERRUPT CONTROL UNIT 8.4.2 Progra
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INTERRUPT CONTROL UNIT Begin Initia
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INTERRUPT CONTROL UNIT 8.4.3.3 ICW2
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INTERRUPT CONTROL UNIT Register Nam
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INTERRUPT CONTROL UNIT Table 8-2. O
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INTERRUPT CONTROL UNIT The ESMM (En
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INTERRUPT CONTROL UNIT Internal Int
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INTERRUPT CONTROL UNIT To Slave 825
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INTERRUPT CONTROL UNIT 8.6.1 Interr
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INTERRUPT CONTROL UNIT CPU WR RD GC
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INTERRUPT CONTROL UNIT Non-Alike Ac
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INTERRUPT CONTROL UNIT ;Now start t
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INTERRUPT CONTROL UNIT ;The followi
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CHAPTER 9 TIMER/COUNTER UNIT The Ti
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TIMER/COUNTER UNIT Timer 0 Timer 1
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TIMER/COUNTER UNIT Continued From "
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TIMER/COUNTER UNIT Register Name: R
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TIMER/COUNTER UNIT The timer counti
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TIMER/COUNTER UNIT Timer 0 Serviced
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TIMER/COUNTER UNIT 9.3.2 Synchroniz
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TIMER/COUNTER UNIT lib_80186 segmen
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TIMER/COUNTER UNIT $mod186 name exa
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TIMER/COUNTER UNIT _CMPB equ word p
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CHAPTER 10 DIRECT MEMORY ACCESS UNI
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DIRECT MEMORY ACCESS UNIT 10.1.1.1
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DIRECT MEMORY ACCESS UNIT The Chip-
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DIRECT MEMORY ACCESS UNIT Both Requ
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DIRECT MEMORY ACCESS UNIT Channel a
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DIRECT MEMORY ACCESS UNIT Register
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DIRECT MEMORY ACCESS UNIT When inte
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DIRECT MEMORY ACCESS UNIT The trans
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DIRECT MEMORY ACCESS UNIT 10.2.4 Su
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DIRECT MEMORY ACCESS UNIT 10.3.1 DR
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DIRECT MEMORY ACCESS UNIT $MOD186 n
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DIRECT MEMORY ACCESS UNIT SECTORS M
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DIRECT MEMORY ACCESS UNIT XOR AX, A
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DIRECT MEMORY ACCESS UNIT $mod186 n
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Serial Communications Unit 11
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SERIAL COMMUNICATIONS UNIT 1 2 3 4
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SERIAL COMMUNICATIONS UNIT The RX m
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SERIAL COMMUNICATIONS UNIT The Tran
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SERIAL COMMUNICATIONS UNIT 5. At th
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SERIAL COMMUNICATIONS UNIT Register
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SERIAL COMMUNICATIONS UNIT Register
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SERIAL COMMUNICATIONS UNIT 3. If th
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SERIAL COMMUNICATIONS UNIT The seri
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SERIAL COMMUNICATIONS UNIT 11.2.3 P
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SERIAL COMMUNICATIONS UNIT BCLK is
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SERIAL COMMUNICATIONS UNIT $mod186
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SERIAL COMMUNICATIONS UNIT mov dx,
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Page 364 and 365: CHAPTER 12 WATCHDOG TIMER UNIT Syst
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Page 386 and 387: INPUT/OUTPUT PORTS 13.1.4.3 Port 3
Page 388 and 389: INPUT/OUTPUT PORTS Register Name: R
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Page 392: Math Coprocessing 14
Page 395 and 396: MATH COPROCESSING 14.3 THE 80C187 M
Page 397 and 398: MATH COPROCESSING Available data ty
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Page 412: CHAPTER 15 ONCE MODE ONCE (pronounc
Page 416 and 417: APPENDIX A 80C186 INSTRUCTION SET A
Page 418 and 419: 80C186 INSTRUCTION SET ADDITIONS AN
Page 426: Input Synchronization B
Page 429 and 430: INPUT SYNCHRONIZATION A synchroniza
Page 432 and 433: APPENDIX C INSTRUCTION SET DESCRIPT
Page 434 and 435: INSTRUCTION SET DESCRIPTIONS Table
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INSTRUCTION SET DESCRIPTIONS Table
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INSTRUCTION SET DESCRIPTIONS NEG NO
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INSTRUCTION SET DESCRIPTIONS SHR ST
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APPENDIX D INSTRUCTION SET OPCODES
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INSTRUCTION SET OPCODES AND CLOCK C
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Index
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INDEX AH register, 2-5 AL register,
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INDEX synchronization, 10-23 transf
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INDEX NMI, 2-42 generating with WDT
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INDEX bus latency, 7-7 calculating
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INDEX Trap exceptions, 2-42 Trap Fl
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80C186EC/80C188EC Microprocessor User's Manual

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