Sharp R-671(B) Service Manual page 23

DESCRIPTION OF LSI
Pin No. Signal
27 RESET
28-29 P71-P70 OUT
30 XIN
31 XOUT OUT
32 VSS
33 P27 OUT
34 P26 OUT
35 P25 OUT
36-40 P24-P20 OUT
41 P17
42 P16
43 P15
44-48 P14-P10
49-56 P07-P00 OUT
57-60 P37-P34
61-72 OUT
SEG11-SEG0
73/74 IN/IN
VCC/VREF
75 AVSS
76 COM3 OUT
77 COM2 OUT
78 COM1 OUT
79 COM0 OUT
80 VL3
...
CONT
I/O
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.
Auto indicator (light emitting diode LD5) driving signal.
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.
Internal clock oscillation frequency control output.
Output to control oscillation input of XOUT.
IN Power source voltage: -5V.
VC voltage of power source circuit input.
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P15 - P17 terminal
while one of tact switches (SW1,SW2,SW3) on matrix is touched.
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P15 - P17 terminal
while one of tact switches (SW4-6) on matrix is touched.
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P15 - P17 terminal
while one of tact switches (SW7-9) on matrix is touched.
Terminal not used.
IN Signalcoming from touch tact switch.
When any one of tact switches SW1, SW4, SW7 on key and jog unit matrix is
touched, a corresponding signal from P25 - P27 will be input into P17. When no
tact switch is touched, the signal is held at "H" level.
IN Signal similar to P17.
When any one of tact switches SW2, SW5, SW8 on key and jog unit matrix is
touched, a corresponding signal will be input into P16.
IN Signal similar to P17.
When any one of tact switches SW3, SW6, SW9 on key and jog unit matrix is
touched, a corresponding signal will be input into P15.
IN Terminal not used.
Terminal not used.
IN Connected to AVSS
Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.)
SEG 0 (72) .............................. S1
SEG 1 (71) .............................. S2
SEG 2 (70) .............................. S3
SEG 3 (69) .............................. S4
SEG 4 (68) .............................. S5
SEG 5 (67) .............................. S6
Connected to GND.
IN Connected to VC.
Terminal not used.
Common data signal: COM3.
Connected to LCD (Pin No. 3).
Common data signal: COM2.
Connected to LCD (Pin No. 2).
Common data signal: COM1.
Connected to LCD (Pin No. 1).
IN Power source voltage input terminal.
Standard voltage for LCD.
Description
LCD (Pin No.)
R-671 - 22
LSI signal (Pin No.) LCD (Pin No.)
SEG 6 (66) ........................... S7
SEG 7 (65) ........................... S8
SEG 8 (64) ........................... S9
SEG 9 (63) ......................... S10
SEG10 (62) ........................ S11
SEG11 (61) ........................ S12