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4513 데이터시트(PDF) 110 Page - Renesas Technology Corp |
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4513 데이터시트(HTML) 110 Page - Renesas Technology Corp |
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110 / 210 page ![]() 4513/4514 Group User’s Manual APPLICATION 2-7 2.1 I/O pins 2.1.3 Port application examples (1) Key input by key scan Key matrix can be set up by connecting keys externally because port D output structure is an N- channel open-drain and port P0 has the pull-up resistor. Outline: The connecting required external part is just keys. Specifications: Port D is used to output “L” level and port P0 is used to input 16 keys. Multiple key inputs are not detected. Figure 2.1.1 shows the key input and Figure 2.1.2 shows the key input timing. Fig. 2.1.1 Key input by key scan SW4 SW3 SW2 SW8 SW7 SW6 SW9 SW11 SW10 SW12 SW16 SW15 SW14 SW13 D0 D1 D2 D3 P00 P01 P02 P03 SW1 SW5 M34513/M34514 |
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