21
R-25AM
Pin No.
Signal
I/O
Description
41-46
P17-P12
OUT
Segment data signal.
Signal similar to P23..
47-48
P11-P10
OUT
Digit selection signal.
The relation between digit signal and digit
are as follows:
Digit signal
Digit
P11 .................... 1st.
P10 ................... 2nd.
P07 .................... 3rd.
P06 .................... 4th.
P05 .................... 5th.
P04 .................... 6th.
Normally, one pulse is output in every ß
period, and input to the grid of the Fluores-
cent Display.
49-52
P07-P04
OUT
Digit selection signal.
Signal similar to P11.
53-55
P03-P01
OUT
Segment data signal.
Signal similar to P23.
56
P00
-
Terminal not used.
57-58
P37-P36
OUT
(Sound) Voltage level control terminal.
This terminal (P37) is to control volume level of buzzer sound with terminals P36.
Since the volume level of buzzer sound depends on voltage energized, it is control
level in 3 steps by combining signal levels for P37 and P36. Relationship of signal
level combination to sound volume level is shown in the following table, 1~3 in the
table, however, are indicated in the descending order from the maximum level of
sound volume through the minimum level.
Sound Volume
P36
P37
1, (Max.)
L
L
2,
H
L
3, (Min.)
L
H
*At Output terminal P47, rectangular wave signal of 2.5kHz is output.
59
P35
-
Terminal not used.
60
P34
OUT
Terminal not used.
61
P33
OUT
Terminal not used.
62
P32
OUT
Terminal not used.
63
P31
OUT
Switch strobe signal.
Signal applied to switch unit section. A pulse signal is input to P24 - P26 terminals
while one of G-4 line switches on switch matrix is touched.
64
P30
OUT
Switch strobe signal.
Signal applied to switch unit section. A pulse signal is input to P24 - P26 terminals
while one of G-5 line switches on switch matrix is touched.
H
L
GND
ß(50Hz)
P11
P10
P07
P06
P05
P04
GND
-31(V)
-31(V)
A
A : 1,(Max) 20V
2, 13V
3,(Min) 7V
