36
R-1880LS/LST
Output to control oscillation input of XIN.
32 VSS IN Power source voltage:-5V.
VC voltage of power source circuit input.
33 P27 IN Signal coming from touch key.
When any one of G12 line keys on key matrix is touched, a corresponding signal will be input
into P27. When no key is touched, the signal is held at "L" level.
34 P26 IN
Signal similar to AN1.
When any one of G11 line keys on key matrix is touched, a corresponding signal will be input
into P26.
35 P25 IN Signal similar to P27.
When any one of G10 line keys on key matrix is touched, a corresponding signal will be input
into P25.
36 P24 IN Signal similar to P27.
When any one of G9 line keys on key matrix is touched, a corresponding signal will be input
into P24.
37-40 P23-P20 OUT Digit selection signal.
The relationship between digit signal and digit are as fol-
lows;
Digit signal Digit Digit signal Digit
P14 ................................. 1st. P20 ................................5th.
P15 ................................2nd. P21 ................................6th.
P16 ................................ 3rd. P22 ................................7th.
P17 .................................4th. P23 ................................8th.
(ß : INTO signal)
Refer to the touch control panel circuit about the relation
between signals and digits. Normally, one pulse is output
in every synchronized signal (ß) period, and input to the grid
of the fluorescent display.
41-44 P17-P14 OUT Digit selection signal. Signal similar to P23.
45-48 P13-P10 OUT Segment data signal. Signal similar to P55.
49 P07 OUT Segment data signal. Signal similar to P55.
50 P06 OUT Segment data signal. Signal similar to P55.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN1 and P27 - P24 terminal
while one of G7 line keys on key matrix is touched.
51 P05 OUT Segment data signal. Signal similar to P55.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN1 and P27 - P24 terminal
while one of G6 line keys on key matrix is touched.
52 P04 OUT Segment data signal. Signal similar to P55.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN1 and P27 - P24 terminal
while one of G5 line keys on key matrix is touched.
53 P03 OUT Segment data signal. Signal similar to P55.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN1 and P27 - P24 terminal
while one of G4 line keys on key matrix is touched.
54 P02 OUT Segment data signal. Signal similar to P55.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN1 and P27 - P24 terminal
while one of G3 line keys on key matrix is touched.
55 P01 OUT Segment data signal. Signal similar to P55.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN1 and P27 - P24 terminal
Pin No. Signal I/O Description
H
L
GND
VP
§(60Hz)
P14
P15
P16
P17
P20
P21
P22
P23
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