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March 2005 © TOSHIBA TEC e-STUDIO520/600/720/850 CONTROL PANEL
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3) LCD drive operation
Fig.5-7
System CPU
LCD
controller
LCD panel
Control panel
CPU
Key switches
and
touch panel
LED
RAM
ASIC
SYS board
Control panel
(c)
(c)
(a)
(b)
(d)
(d)
Flash ROM
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.
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