硬件接口开发系列之

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.,,PCCDLAN

.1.

2.

1.

TTL74XXXTTL7474LS,74ALS,74S74FCMOS4000400074HC,74HCT74C

2. PCRS-232,,SCSI,USBRS-232;;SCSIUSB ,,;,,,

. DAC)ADC)

1.DAC)DACDACR-2RDACPWM)DACDAC

2. DAC)(1) DAC 08008(2) AD 588 (3) AD 7548 812(4) MAX 521 8

3.ADC)FLASH ADCSampling ADC)Integrating ADC)

4. ADC)(1) ADC 0804 (2) MAX 158 88(3) MAX 186 128(4) MAX 111MAX14

.1. 2. DATA3. CONTROL4. STATUS5. 6.

1. CentronicsCentronicsPC 8DATA4CONTROL5STATUS)

PcD7:D0)IOR* IOW*A9-A0IRQ5/IRQ71223184525D4OE*IRQ

DB-25CentronicriI/O11ControlC0*nSTROBE2-92-9DataD1-D8DATA1-DATA8SPP1010StatusS6nACK1111StatusS7*BUSY1212StatusS5PE1313StatusS4SELECT1414ControlC1*AUTO FEED1532StatusS3nERROR1631ControlC2nINIT1736ControlC3*nSELECT-IN18-2519.21.23.25.27.29.30.34GROUND

2. DATADATACPU8D0-D7252-9D0-D7DATADATA16x78hx7Chx23IBM PC/ATDATA

DATAPC74LS37474LS24423456789C=0.0022uF07

3. CONTROLcontrolcontrolD254IRQENSTATUSnACKCONTROL74LS240IRQEN74LS126CONTROL

CONTROL1oc1oc11oc1oc11161417+5vR=4KcR=27C=0.0022ufC0*C1*c2C3*IRQ EN(bit c4)74ls128

74ls24074ls174PcD0D4D3D0D4

4. STATUSSTATUS,STATUSDATA160x3790x3BDSTATUSS3-S7CONTROLSTATUSS6IRQ5IRQ7)PCSTATUS

STATUS(IBM PC/AT111015121374LS240DBUSYnACKPESELECTnERRORS7S6S5S4S374LS126D7D3CONTROL(IRQ EN)IRQ5IRQ7PC

5. DATA0.5us0.5us0.5us7us5usnSTROBEBUSYnACK

,DATA,nSTROBE,BUSYnACKPCDATANstrobeDATAPCNstrobeBUSYackBUSYBUSY

6. 5484417TTLPC25DPCPC2536Centronics

.1. PC2. 3. 4. 5. DIP6.

1. PCPCPCBIOS(MS-DOS)PCDATASTATUS DATA,CONTROLDATA

2. STATUSCONTROL(8,54)DATAC outportb(port_address,data); :Data_variable=inportb(port_address);

3. RS-23225DPCBDATAcontrolcontrolLED,DATASTATUSDATADATASTATUS

4. 5

MOSFETMOSFETMOSFETTTLTTLMOSFET ULN2003ATTLMOSFET7ULN2003ATTL

5. DIPDIP,,DIP165,SER,LOAD,CLK165QH,LOAD24CLK,S7*243DIP

DIP44)HCT165WS_DIP-8CLKLOAD(D0)SH/LDINHCLKHGFEDCBAQHQH18916HCT165WS_DIP-8CLKSH/LDINHCLKHGFEDCBAQHQH18916HCT165WS_DIP-8CLKLOAD(D0)SH/LDINHCLKHGFEDCBAQHQH18916S3S1S2SERSERSER(S7*)797979U1U3U2

6. DATASTATUS105I/O(200-300Kbps)DATADATA(EPP)(ECP)

.1. IEEE 1248 19942. 3. EPP4. EPP BIOS5. EPPI/O6. EPP7. 8.

1. IEEE 1248 19941991IEEE 12481994-IEEE 1248PC20-50IEEE 1248IEEE 12485

Centronicsstatusdata EPPECP

2. EPPIEEE 1248(Intel,Xircom,Zenith Data SystemsIEEE EPPEPPCCP17143EPP

3. EPPEPPEPPSPP DATA1SPPSTATUS2SPPCONTROL3EPP ADDRESS4-7EPP DATA4DATA57I/O1632(32I/O),

4. EPP BIOSI/OEPPEPP BIOSBIOS|I/OEPPEPPEPP BIOSBIOSI/O,Install Check,Set Mode,Interrupt Control,EPP Reset,Address Read,Address Write

6. EPPPCEPPEPPEPPEPP5EPPEPPEPP ADDRESSEPP DATAEPPSPPEPP(ECR,0x402h)

ECREPPSMCFDC37C665/66ECRECR567FDPC87332ECRECR567SMCFDEPPEPP1EPP 2EPPEPP 3EPP ADDRESSDATAEPP

7. ECP)HPMicrosoftpc/ECPEPPECPRLERLE

8. IEEE 1248EPPECPIEEE 1248Texas InstrumentNational Semiconductor

.

1. 2. EPP3. EPP8255-PPIO

1. DATACONTROL44DATA4CONTROL44/1615

48DATA74HCT273*40-78-1516-2324-31C0*C1*C2C3*

2. EPPEPPEPPI/OI/ODATA

EPPI/O*3EPP8I/O8I/O8I/O8

3. EPP8255-PPIO82558255I/O8255-PPIO8255EPP

EPP8255165

8255PCBIOS

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8I/OADC8Maxim8ADC,ADC8884ADC

ADC*1*0S4-S7C0-C23/8CS*RD*MAX15807IN0IN7

8(121)

J1 DB-25D0-D7DATAC0*,C1*,C2,C3*CONTROLS4,S5,S6S7STATUS 74HCT138Y0-Y7SEL_0-SEL_7SEL_074HCT74(U4-A)174HCT74DSEL_1374HCT244ADC8STATUSU5U68I/OU7AU7B8I/O

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EPROM