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[COLOUR PLOTTER PRINTER CONTROL LSI] |
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Pin assignment |
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Symbol | Name | In/out |
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Vss |
| Ground |
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| Connected to QV. |
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Vcc |
| Main power |
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| Connected to SV. |
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VDD |
| Power |
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| Connected to SV. |
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PROG |
| Program | Out |
| Not used. |
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Plo - | PI 7 | Port I |
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| Used as printer control signals. |
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P20 - | P27 | Port 2 |
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| Used for data input port from CPU. |
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Do | Data bus |
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| Used for stepper motor control signals. |
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To |
| Test pin Q | In |
| Input from pen change switch. |
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Tl |
| Test pin I | In |
| Input from paper feed switch. |
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INT |
| Interrupt input | In |
| Data transfer strobe MZ· 700 |
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RD |
| Read signal | In |
| Not used. |
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WR |
| Write signal | Out |
| Not used. |
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RESET | Reset | In |
| Used to initialize the processor. |
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ALE |
| Address latch enable | Out |
| Not used. |
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PSEN |
| Program store enable | Out |
| Not used. |
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SS |
| Single step | In |
| Not used. |
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EA |
| External access | In |
| Active when EA = QV. |
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| Pins used to attach the crystal oscillator or RC network to |
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Xl, X2 | Crystal inputs | In |
| generate internal clock. However, external clock signal may be |
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| inpu tted through these pins. |
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22
