Toshiba e-STUDIO520 Service Manual page 119

3) LCD drive operation
The following describes the drive operation to display the message "READY".
(a) The System CPU requests the Flash ROM data to display "READY".
(b) The Flash ROM outputs data to display the message to the System CPU.
(c) The System CPU writes the data to be displayed on the LCD panel into the RAM.
(d) The LCD controller/driver reads the display data from the RAM, and outputs the data to the LCD
panel.
SYS board
ASIC
LCD
controller
(d)
Control panel
March 2005 © TOSHIBA TEC
(c)
(c)
RAM
(d)
LCD panel
Fig.5-7
5 - 15
(a)
System CPU Flash ROM
(b)
Control panel
CPU
Key switches
LED
and
touch panel
e-STUDIO520/600/720/850 CONTROL PANEL
5