21
R-3H57
Pin No.
Signal
I/O
Description
40
P50
OUT
Digit selection signal.
The relationship between digit signal and digit are as follows;
Digit signal
Digit
P50 ........................... 1st.
P51 .......................... 2nd.
P52 .......................... 3rd.
P53 ........................... 4th.
P54 ........................... 5th.
P55 .......................... 6th.
P56 .......................... 7th.
Normally, one pulse is output in every
period, and input to the grid of the Fluores-
cent Display.
41-46
P51-P56
OUT
Digit selection signal.
Signal similar to P50.
47
P57
OUT
Segment data signal.
Signal similar to P46.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P70-P73 terminal while
one of G8 line keys on key matrix is touched.
48
Vdisp
IN
Anode (segment) of Fluorescent Display light-up voltage: -31V.
Vp voltage of power source circuit input.
49-55
P60-P66
OUT
Segment data signal.
Signal similar to P46.
56
P67
OUT
Terminal not used.
57
P70
IN
Signal coming from touch key.
When any one of G12 line keys on key matrix is touched, a corresponding signal from
P40-P46,P57 will be input into P70. When no key is touched, the signal is held at "L"
level.
58
P71
IN
Signal coming from touch key.
When any one of G11 line keys on key matrix is touched, a corresponding signal from
P40-P46,P57 will be input into P71.
59
P72
IN
Signal coming from touch key.
When any one of G10 line keys on key matrix is touched, a corresponding signal from
P40-P46,P57 will be input into P72.
60
P73
IN
Signal coming from touch key.
When any one of G9 line keys on key matrix is touched, a corresponding signal from
P40-P46,P57 will be input into P73.
61-64
P74-P77
OUT
Terminal not used.
ß
P50
P51
P52
P53
P54
P55
(50Hz)
H
L
GND
VP
P56