M38203M4 Datasheet, PDF (97/344 Pages) Mitsubishi Electric Semiconductor – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
2.1 I/O pins
(A)
Œ

Ž

(A)

‘
’
Charge time
T
Charge time
CMOS I/O
“H” output
port A
“L” output
CMOS I/O
“H” output
port B
“L” output
t2
“H” output
Input
Read port state
Input
t1
“H” output
t2
Input
Read port state
Input
CMOS I/O
“H” output
port C
“L” output
Input
“H” output
Input
CMOS I/O
“H” output
port D
“L” output
“L” output
“H” output
“L” output
Fig. 2.1.12 Timing diagram 2 where switch A is pressed
With the exception that “L” is output using port D for key input (refer to “Figure 2.1.12 (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 kΩ is connected.
3820 GROUP USER’S MANUAL
2–11