Sharp R-55TS Service Manual page 26

R-55TS
Pin No. Signal I/O
36 P24 IN
37-40 P23-P20 OUT
41 P17 OUT
42 P16 OUT
43 P15 OUT
44 P14 OUT
45-48 P13-P10 IN
49-56 P07-P00 OUT
57-59 P37-P35 IN
60-72 OUT
SEG12-SEG0
73 VCC IN
74 VREF IN
75 AVSS IN
76 COM3 OUT
77 COM2 OUT
78 COM1 OUT
79 COM0 OUT
80 VL3 IN
Signal similar to P27.
When any one of tact switches SW4, SW8, SW12 on switch unit matrix is touched, a
corresponding signal will be input into P24.
Terminal not used.
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P24 - P27 terminal while one
of tact swithes (SW1, SW2. SW3, SW4) on matrix is touched.
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P24 - P27 terminal while one
of tact swithes (SW5, SW6. SW7, SW8) on matrix is touched.
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P24 - P27 terminal while one
of tact swithes (SW9, SW10. SW11, SW12) on matrix is touched.
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P24 - P27 terminal while one
of tact swithes (SW13, SW14. SW15) on matrix is touched.
Terminal not used.
Terminal not used.
Terminal not used.
Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.)
SEG 0 (72) ......................... SEG0
SEG 1 (71) ......................... SEG1
SEG 2 (70) ......................... SEG2
SEG 3 (69) ......................... SEG3
SEG 4 (68) ......................... SEG4
SEG 5 (67) ......................... SEG5
SEG 6 (66) ......................... SEG6
Connected to GND.
Connected to GND.
Connected to VC.
Terminal not used.
Common data signal.
Connected to LCD (COM2).
Common data signal.
Connected to LCD (COM1).
Common data signal.
Connected to LCD (COM0).
Power source voltage input terminal.
Standard voltage for LCD.
24
Description
LCD (Pin No.) LSI signal (Pin No.) LCD (Pin No.)
SEG7 (65) ....................... SEG7
SEG8 (64) ....................... SEG8
SEG9 (63) ....................... SEG9
SEG10 (62) ................... SEG10
SEG11 (61) ................... SEG11
SEG12 (60) ................... SEG12