Sharp CD-RW5000, Service Manual

Page: 62 / 80

CD-RW5000
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LCD710: RUNTZ0021AWZZ
LCD DISPLAY
LCD (12 characters 3 lines)
with lcons
VLOUT
C1- C1+ C2- C2+
VC1 VCC
GND
/RD /WR
/CS
/RESET
DB4-DB7
RS
3
60
7
4+COMS
7+COMS
Pin No. Pin Name Connect to Description I/O
1 VLOUT Booster
capacitance
Potential difference between VCI and GND is boosted twice and then
output. Magnitude of boost is selected by instruction. O
— 2, 3 C1-, C1+ Booster
capacitance
External capacitance should be connected here.
—
4, 5 C2-, C2+ Booster
capacitance
External capacitance should be connected here.
I 6 VCI Power supply Inputs a reference voltage and supplies power to the booster,
generates the LCD drive voltage from the operating voltage.
VCI=0~2.2V
— 7 VCC Power supply 5V
— 8 GND Power supply 0V
I
9 /RD MPU For a 80-system parallel bus interface. Read data at low level.
I 10 /WR MPU For a 80-system parallel bus interface. Write data at low level.
I 11 RS MPU "L" :Instruction; "H" :Data.
I
12 /CS MPU Low :LCD control IC is selected and can be accessed.
High :LCD control IC is not selected and can not be accessed.
I 13 /RESET MPU or external
R-C circuit
Reset pin. Initializes the LSI when low. Must reset after power-on.
I/O 14 DB4 MPU Data bit 4. For a bidirection four-bit parallel bus.
I/O 15 DB5 MPU Data bit 5. For a bidirection four-bit parallel bus
I/O
16 DB6 MPU Data bit 6. For a bidirection four-bit parallel bus
I/O
17 DB7 MPU Data bit 7. For a bidirection four-bit parallel bus