Sharp R-2397 Service Manual page 21

Pin No. Signal I/O
27 RESET IN
28 XIN IN
29 XOUT OUT
30/31 XCIN/XCOUTIN/OUT Terminal not used.
32 VSS IN
33 ø OUT
34 R3 IN
35 R2 IN
36 R1 IN
37 R0 IN
38 VP IN
39 P17 OUT
40 P16 OUT
41 P15 OUT
42-43 P14-P13 OUT
44 P12 OUT
45 P11 OUT
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is supplied. Temporarily set
to "L" level the moment power is supplied, at this time the LSI is reset. Thereafter set at
"H" level.
Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
Power source voltage: -5V.
VC voltage of power source circuit input.
Terminal not used.
Signal coming from touch key.
When either one of G-12 line keys on key matrix is touched, a corresponding signal out
of P11, P12, P14-P17 will be input into R3. When no key is touched, the signal is held at
"L" level.
Signal similar to R3.
When either one of G-11 line keys on key matrix is touched, a corresponding signal will
be input into R2.
Signal similar to R3.
When either one of G-10 line keys on key matrix is touched, a corresponding signal will
be input into R1.
Signal similar to R3.
When either one of G-9 line keys on key matrix is touched, a corresponding signal will
be input into R0.
Anode (segment) of Fluorescent Display light-up voltage: -31V
Vp voltage of power source circuit input.
Segment data signal.
The relation between signals and indicators are as follows:
Signal Segment Signal
P24 .................. i P13 ..................... f
P23 ................ j,k P12 .................... e
P17 ............... LB P11 .................... d
P16 .............. UB P10 .................... c
P15 ................. h P07 .................... b
P14 ................. g P06 .................... a
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R0-R3 terminal while one
of G-6 line keys on key matrix is touched.
Segment data signal. Signal similar to P17.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R0-R3 terminal while one
of G-5 line keys on key matrix is touched.
Segment data signal. Signal similar to P17.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R0-R3 terminal while one
of G-4 line keys on key matrix is touched.
Segment data signal.
Signal similar to P17.
Segment data signal. Signal similar to P17.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R0-R3 terminal while one
of G-8 line keys on key matrix is touched.
Segment data signal. Signal similar to P17.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R0-R3 terminal while one
of G-7 line keys on key matrix is touched.
19
Description
Segment
ß(50Hz)
R-2397
GND
-31(V)