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4513 Datasheet(PDF) 110 Page - Renesas Technology Corp

No. de pieza 4513
Descripción Electrónicos  4-BIT SINGLE-CHIP MICROCOMPUTER
PDF  210 Pages
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Fabricante Electrónico  RENESAS [Renesas Technology Corp]
Página de inicio  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

4513 Datasheet(HTML) 110 Page - Renesas Technology Corp

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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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