Service manual

R-820JS
26
Pin No. Signal I/O Description
35 RESET IN Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily
set to "L" level the moment power is applied, at this time the LSI is reset. Thereafter
set at "H" level.
36 XCIN IN Terminal not used.
37 XOUT IN 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 OUT terminal.
39 XOUT OUT Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
40 VSS IN Power source voltage: -5V.
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 P70 - P73 terminal while
one of G4 line key on matrix is touched.
42 P26 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P70 - P73 terminal while
one of G3 line key on matrix is touched.
43 P25 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P70 - P73 terminal while
one of G2 line key on matrix is touched.
44 P24 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P70 - P73 terminal while
one of G1 line key on matrix is touched.
45 P23 OUT Common data signal: COM5.
Connected to LCD (Pin No. 37)
46-50 P22 - P16 OUT Segment data signal.
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 0 (90) ............... SEG45 (51) SEG23 (67) ............ SEG17 (17)
SEG 1 (89) ............... SEG44 (50) SEG24 (66) ............ SEG16 (16)
SEG 2 (88) ............... SEG43 (49) SEG25 (65) ............ SEG15 (15)
SEG 3 (87) ............... SEG42 (48) SEG25 (65) ............ SEG15 (32)
SEG 4 (86) ............... SEG41 (47) SEG26 (64) ............ SEG14 (14)
SEG 5 (85) ............... SEG40 (46) SEG27 (63) ............ SEG13 (13)
SEG 6 (84) ............... SEG39 (45) SEG28 (62) ............ SEG12 (12)
SEG 7 (83) ............... SEG38 (44) SEG29 (61) ............ SEG11 (11)
SEG 8 (82) ............... SEG37 (43) SEG30 (60) ............ SEG10 (10)
SEG 9 (81) ............... SEG31 (31) SEG31 (59) .............. SEG 9 ( 9)
SEG10 (80) .............. SEG30 (30) SEG32 (58) .............. SEG 8 ( 8)
SEG11 (79) .............. SEG29 (29) SEG33 (57) .............. SEG 7 ( 7)
SEG12 (78) .............. SEG28 (28) SEG34 (56) .............. SEG 6 ( 6)
SEG13 (77) .............. SEG27 (27) SEG35 (55) .............. SEG 5 ( 5)
SEG14 (76) .............. SEG26 (26) SEG36 (54) .............. SEG 4 ( 4)
SEG15 (75) .............. SEG25 (25) SEG37 (53) .............. SEG 3 ( 3)
SEG16 (74) .............. SEG24 (24) SEG38 (52) .............. SEG 2 ( 2)
SEG17 (73) .............. SEG23 (23) SEG39 (51) .............. SEG 1 ( 1)
SEG18 (72) .............. SEG22 (22) P16 (50) ................. SEG32 (38)
SEG19 (71) .............. SEG21 (21) P17 (49) ................. SEG33 (39)
SEG20 (70) .............. SEG20 (20) P20 (48) ................. SEG34 (40)
SEG21 (69) .............. SEG19 (19) P21 (47) ................. SEG35 (41)
SEG22 (68) .............. SEG18 (18) P22 (46) ................. SEG36 (42)