Pin No. | Signal | I/O |
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27 | RESET | IN | Auto clear terminal. |
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| Signal is input to reset the LSI to the initial state when power is supplied. Temporarily set | |||||||||||||||
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| to "L" level the moment power is supplied, at this time the LSI is reset. Thereafter set at | |||||||||||||||
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| "H" level. |
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28 | XIN | IN | Internal clock oscillation frequency setting input. | |||||||||||||||
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| The internal clock frequency is set by inserting the ceramic filter oscillation circuit with | |||||||||||||||
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| respect to XOUT terminal. |
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29 | XOUT | OUT | Internal clock oscillation frequency control output. | |||||||||||||||
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| Output to control oscillation input of XIN. |
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30/31 | XCIN/XCOUTIN/OUT | Terminal not used. |
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32 | VSS | IN | Power source voltage: |
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| VC voltage of power source circuit input. |
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33 | ø | OUT | Terminal not used. |
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34 | R3 | IN | Signal coming from touch key. |
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| When either one of | |||||||||||||||
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| of P11, P12, | |||||||||||||||
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| "L" level. |
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35 | R2 | IN | Signal similar to R3. |
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| When either one of | |||||||||||||||
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| be input into R2. |
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36 | R1 | IN | Signal similar to R3. |
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| When either one of | |||||||||||||||
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| be input into R1. |
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37 | R0 | IN | Signal similar to R3. |
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| When either one of | |||||||||||||||
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| be input into R0. |
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38 | VP | IN | Anode (segment) of Fluorescent Display | |||||||||||||||
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| Vp voltage of power source circuit input. |
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39 | P17 | OUT | Segment data signal. |
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| The relation between signals and indicators are as follows: | |||||||||||||||
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| Signal | Segment | Signal | Segment |
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| P24 | i | P13 | f |
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| P23 | j,k | P12 | e | ß(50Hz) |
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| P17 | LB | P11 | d |
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| GND | ||||||
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| P16 | UB | P10 | c |
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| P15 | h | P07 | b |
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| P14 | g | P06 | a |
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| Key strobe signal. |
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| Signal applied to | |||||||||||||||
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| of |
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40 | P16 | OUT | Segment data signal. | Signal similar to P17. |
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| Key strobe signal. |
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| Signal applied to | |||||||||||||||
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| of |
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41 | P15 | OUT | Segment data signal. | Signal similar to P17. |
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| Key strobe signal. |
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| Signal applied to | |||||||||||||||
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OUT | Segment data signal. |
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| Signal similar to P17. |
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44 | P12 | OUT | Segment data signal. | Signal similar to P17. |
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| Key strobe signal. |
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| Signal applied to | |||||||||||||||
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45 | P11 | OUT | Segment data signal. | Signal similar to P17. |
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| Key strobe signal. |
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19