26
R-1850
R-1851
31
XOUT
OUT
Internal clock oscillation frequency control output.
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
follows;
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 rela-
tion 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.
Pin No.
Signal
I/O
Description
H
L
GND
VP
ß(60Hz)
P14
P15
P16
P17
P20
P21
P22
P23
