3825 datasheet(83/339 Pages) RENESAS

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2.1 I/O pins

APPLICATION

3825 GROUP USER’S MANUAL

2–11

With the exception that “L” is output using port D for key input (refer to “Figure 2.1.13 (A)”), the basic

structure is the same as that shown in (1).

The examples shown in (1) and (2) are already put into practical use. However, be sure to evaluate

them on the user’s side.

In this example, the ports are the same structure as the equivalent circuit which a pull-up resistor of

about 1 k

is connected.

Fig. 2.1.13 Timing diagram 2 where switch A is pressed

CMOS I/O

port A

“L” output

“H” output

Read port

state

Charge time

“H” output

Charge time

CMOS I/O

port B

“L” output

“H” output

Input

“H” output

CMOS I/O

port D

“L” output

“H” output

“L” output

“H” output

CMOS I/O

port C

“L” output

“H” output

Input

“H” output

“L” output

(A)

Read port state

Input

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