4500/720 Series 720 Family Models 4513, 4514 Group User's Manual

2-8
APPLICATION
2.1 I/O pins
4513/4514 Group User’s Manual
Fig. 2.1.2 Key scan input timing
D 0
D 1
D 2
D 3
IAP0 IAP0 IAP0 IAP0 IAP0
“H”
“L”
“H”
“L”
“H”
“L”
“H”
“L”
Input to
SW1–SW4
Input to
SW13–SW16
Input to
SW9–SW12
Input to
SW5–SW8
Input to
SW1–SW4
Key input period
Switching key input selection port (D →D
)
Stabilizing wait time for input
Reading port (key input)
Note: “H” output of port D becomes high-impedance state.
0
1