Read Sharp AR-810 (serv.man24) Service Manual online
AR-651/810 CONTROL PANEL 5 - 9
(4) Data transmission
(3) LCD drive operation
The following describes the drive operation to display the message “READY”.
(a) The System CPU requests the
PROM data to display “READY”.
(b) The PROM outputs data to display
the message to the System CPU.
(c) The System CPU writes the data to
be displayed on the LCD into the
RAM.
(d) The LCD controller/driver reads the
display data from the RAM, and out-
puts the data to the LCD.
PROM
CPU
R
A
M
A
M
LED
LED
LCD
KEY CPU
PWA-F-DSP-300
PWA-F-SYS-300
GA
LCD
System
(a)
(b)
(c)
(c)
(d)
(d)
LOAD
FRAME
LOAD
240
1
2
240
CP x(320/4) pulses
1
2
240
1/tF
1/tF
1
2
FRAME
D0-D3
CP
controller
driver
PWA-F-SYS-340
PWA-F-DSP-340, PWA-F-MKEY-340, PWA-F-SKEY-340
Key switches
and
touch panel
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