Sharp R-380A, Service Manual

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R-380A
18
36-37 P81-P80 OUT Terminal not used.
38 XIN IN Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit
with respect to XIN terminal.
39 XOUT OUT Internal clock oscillation frequency control output.
Output to control oscillation input of XOUT.
40 VSS IN Power source voltage: -5.1V.
VC voltage of power source circuit input.
41 P27 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P74 - P77 terminal
while one of G8 line keys on key matrix is touched.
42 P26 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P74 - P77 terminal
while one of G7 line keys on key matrix is touched.
43 P25 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P74 - P77 terminal
while one of G6 line keys on key matrix is touched.
44 P24 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P74 - P77 terminal
while one of G5 line keys on key matrix is touched.
45 P23 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P74 - P77 terminal
while one of G4 line keys on key matrix is touched.
46 P22 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P74 - P77 terminal
while one of G3 line keys on key matrix is touched.
47 P21 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P74 - P77 terminal
while one of G2 line keys on key matrix is touched.
48 P20 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P74 - P77 terminal
while one of G1 line keys on key matrix is touched.
49-50 P17-P16 OUT Terminal not used.
51-62
SEG39-SEG28
IN Terminal not used.
63-66
SEG27-SEG24
OUT Segment data signals.
Connected to LCD.
The relation between signals are as follows:
LSI Signal (Pin No.)
LCD (Pin No.) LSI Signal (Pin No.) LCD (Pin No.)
SEG 27 (63) ............................. S0 SEG 12 (78) ............................. S5
SEG 26 (64) ............................. S1 SEG 11 (79) ............................. S6
SEG 25 (65) ............................. S2 SEG 10 (80) ............................. S7
SEG 24 (66) ............................. S3 SEG 9 (81) ............................... S8
SEG 22 (68) ............................. S4 SEG 8 (82) ............................... S9
SEG 21 (69) ........................... S26 SEG 6 (84) ............................. S10
SEG 20 (70) ........................... S25 SEG 5 (85) ............................. S11
SEG 19 (71) ........................... S24 SEG 4 (86) ............................. S12
SEG 18 (72) ........................... S23 SEG 3 (87) ............................. S13
SEG 17 (73) ........................... S22 SEG 2 (88) ............................. S14
SEG 16 (74) ........................... S21 SEG 1 (89) ............................. S15
SEG 14 (76) ........................... S20 SEG 0 (90) ............................. S16
SEG 13 (77) ........................... S19
67 SEG23 OUT Terminal not used.
68-74
SEG22-SEG16
OUT Segment data signal.
Signal similar to SEG27.
75 SEG15 OUT Terminal not used.
76-82
SEG14-SEG8
OUT Segment data signal.
Signal similar to SEG27.
83 SEG7 OUT Terminal not used.
84-90
SEG6-SEG0
OUT Segment data signal.
Signal similar to SEG27.
91 VCC IN Connected to GND.
92 VREF IN Connected to GND.
Pin No. Signal I/O Description