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MITSUBISHI MICROCOMPUTERSMS0790SPINPUT/OUTPUT EXPANDERDuring direction register changingRO-3----------~~ ______ ....... JrAddressCER/W-----_.p(output)'-...... --21~t+-----Hi9h impedance state ------P ---High impedance state --~
MITSUBISHI MICROCOMPUTERSMS0790SPINPUT/OUTPUT EXPANDER.APPLICATION EXAMPLESConnection with M50740SPFig. 1 shows the connections between the M?0790SP I/Oexpander and the M50740-XXXSP. The addresses listed inTable 1 are reserved for the M50790SP, and data read andwrit~ operations are possible in the same way as for the 'internalports of the M50740-XXXSP. (Only the low-order 4bits of the data are valid.) The timing and control signalsare generated automatically at the M50740-XXXSP end.The operation is now described. The output ports are setOFF state and the input/output ports are placed in thehigh-impedance state by the RESET OUT signal from theM50740-XXXSP.. Port inputting or outputting is conducted by the same instructionsas those to the M50740-XXXSP's other zero pagememory. With output port P40 - 1'44 read operations thecontents of the respective output latches. can be read out.With input/output ports P45- P49 the contents of the directionregister can determine whether the read data comefrom the output latches or input ports. "1 's" for each directionregister bit signifies output and "O's" signifies input.The contents of the direction registers cannot be read out.They must be set using the store instruction. Table 2 showsthe codes written into the direction registers and the statesof the input/output bits of the ports.Fig. 2 shows the construction of each of the output ports.When an address shown in Table 1 is accessed, double thenormal instruction execution time is required and so caremust be taken when calculating the processing time.This precaution must be taken since a margin is providedfor interfacing with the I/O expander.5V7 ....... 14VINTCNTRP3Vee1>31R/W32CE 33121>11R/W10 CEV DDP49P48P478X4P2PlPORESETouTR3R2RlRoVss272829301 K,QX416151413RESR3R2RlRoVssP46P45P44P43P42P41P404Xl0M50740-XXXSPM50790SPFlg.lExample of connections between 1/0 expander (M50790SP) and microcomputer (M50740':'XXXSP)6-24 • MITSUBISHI.... ELECTRIC
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MITSUBISHI MICROCOMPUTERSCONTENTSDG
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GUIDANCE D
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MITSUBISHI MICROCOMPUTERSDEVELOPMEN
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MITSUBISHI MICROCOMPUTERSORDERING I
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MITSUBISHI MICROCOMPUTERSPACKAGE OU
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MITSUBISHI MICROCOMPUTERSLE,:lTER S
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MITSUBISHI MICROCOMPUTERSLETTER SYM
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MITSUBISHI MICROCOMPUTERSSYMBOLOGYN
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. MITSUBISHI MICROCO.MPUTERSQUALITY
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MITSUBISHI MICROCOMPUTERSPRECAUTION
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MITSUBISHI MICROCOMPUTERSMS0760·XX
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~MITSUBISHI MICROCOMPUTERSMS0760·X
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MITSUBISHI MICROCOMPUTERSMS0760-XXX
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MELPS 740 MICROCOMPUTERSEJ
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MIT~UBISHI MICROCOMPUTERSMS0740-XXX
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. MITSUBISHI MICROCOMPUTERSMS0740-X
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60 16 12 16 A0 16 AOC $A012Absolute
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MITSUBISHI MICROCOMPUTERSMS0740.XXX
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MITSUBISHI MICROCOMPUTERSMSf)740·X
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~~MITSUBISHI MICROCOMPUTERSMS0740-X
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IMITSUBISHI MICROCOMPUTERSMELPS 8-4
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MITSUBISHI MICROCOMPUTERSMELPS 8-48
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MITSUBISHI MICROCOMPUTERSMELPS 8·4
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MITSUBISHI MICROCOMPUTERSMELPS 8·4
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MITSUBISHI MICROCOMPUTERSMSL8048-XX
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~MITSUBISHI MICROCOMPUTERSMSL8048-X
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MITSUBISHI MICROCOMPUTERSMSL8049-XX
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MITSUBISHI MICROCOMPUTERSMSL8049H-X
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MITSUBISHI MICROCOMPUTERSMSM80S0H-X
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MITSUBISHI MICROCOMPUTERSMSM80S0H-X
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MITSUBISHI MICROCOMPUTERSMSM80S0L-X
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MITSUBISHI MICROCOMPUTERSMSM80C49-X
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MITSUBISHI MICROCOMPUTERSMSM80C49·
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MELPS 8-41 SLAVE MICROCOMPUTERS
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MITSUBISHI MICROCOMPUTERSMELPS'8·4
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MITSUBISHI MICROCOMPUTERSMELPS8·41
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APPENDICES
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MITSUBISHI MICROCOMPUTERSMELPs 760
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MITSUBISHI MICROCOMPUTERSMELPS 740
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CONTACT ADDRESSES FOR FURTHER INFOR
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1984 MITSUBISHI DATA BOOKSINGLE-CHI
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MITSUBISHI MICROCOMPUT~K:'MSL8048-X
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MEMO
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