3

MPU: Micro Processing Unit(CPU:Central Processing Unit)CPU

808616,29,000

168088

8088:16 bit; :8 bit

3.1 8086/8088 CPU3.2 8086/8088 CPU3.3 8086/8088 3.4

3.1 8086/8088 CPU 8086 CPU8086 BIU (Bus Interface Unit) EU (Execution Unit)

AH ALBH BLCH CLDH DL SP BP DI SIALU1 2 3 4 5 6 CS DS SS ES IP I/O20168 EU BIU8086CPU

1. 2. 3.4. 5. 6.

1EU 4AXBXCXDX 4 ALU

AX:BX:CX:DX:16SI:DI:SIDI SP:BP:

2 (BIU) :I/O

14CS16 DS16 ES16 SS16

216IP 16IP320 46

3 BIUEU 80862BIU EU EUBIUBIU 4.

4 AXBXCXDX

168

5. Flag Register 16CPU

167D15 OF DF IF TF SF ZF AF PF CF1-0-1-810-811-440-441-00-0D0

1 1CF2ZF3SF4 OF 5 PF :116AFD3D4/

21DF=1,2IF =1,3TF=1,

6. BIU16162020I/O

8086 8086CPU1M 64K

1M 00000HFFFFFHCPU CPU20

808620

1CS=B000HDS=1CDEHSS=4200HES=0150H,64KB1

1

2CS=0200HDS=0400HSS=0480H02000H04000H04800H8KB2KB256B

2

2

3.2 8086/8088 CPU 1.80862.3.4.

18086 8086CPU 8086 8086

28086CPU 8086CPU: 40

:/

33/

01020304050607080910111213141516171819204039383736353433323130292827262524232221GNDAD14/A14AD13/A13AD12/A12AD11/A11AD10/A10AD9/A9AD8/A8AD7AD6AD5AD4AD3AD2AD1AD0NMIINTRCLKGNDVCC5VAD15/A15A16/S3A17/S4A18/S5A19/S6/BHE/S7MN//MX/RDHOLD/RQ//GT0 HLDA/RQ//GT1/WR/LOCKM//IO/S2DT//R/S1/DEN/S0ALEQS0/INTAQS1/TESTREADYRESET8086/80881.2.3.4.5.

8088

/BHE/S78/T1/BHE8D15-D8

80861M2512K

--- A0

16

3 MN/MX+5V 8234A 828274LS373 4. 8286/8287

8284A

4 8288

8288CPUI/O/82828286

3.3 8086/8088 1. 2. 3.

1. 0FFFF0H

CLKRESETRESET8086

2. :

: I/O

8086T1-T4 Tw

1) T1M/IOI/O 4 16 ALE BHE8 T2AD15-AD0 T3CPU TwT3Tw T4CPU

CLKT1T2T3TWT4M//IOA19/S6-A16/S3A19-A16/BHE/S7/BHES7-S3ALEREADYAD15-AD0/RDDT//R/DENCPUI/O

2) 0. T1M/IOI/O 416 ALE BHE8 T2CPUAD15-AD0 T3CPU TwT3Tw 8.T4CPU

CLKM//IOA19/S6-A16/S3A19-A16/BHE/S7/BHES7-S3ALEREADYAD15-AD0/WRDT//R/DENCPUI/OT1T2T3TWT4

3. 3--13--23--33--43--5

3--11) 2) 256

1) NMIIFINTRIF=1

2) CPU

3--2

000003FFH

EXAMPLE:

3--3

3--4

CLKT1T2T3T4T1T2T3T4ALE/INTAAD7-AD08086

3--5