Toshiba e-studio3511, e-studio4511 Manual page 106

(3) System diagram
Signals flowing between the control panel and the system board are indicated in the chart below.
When the panel processing CPU detects that the control panel is operated, the operational contents are
transmitted to the System board through the serial data. The state of the equipment and the messages
from the System board are received by the LCD controller and then displayed on the LCD. The LED and
buzzers are switched to ON/OFF with the signals from the System control PC board.
5
(4) Data Transmission
FRAME
LOAD
FRAME
LOAD
CP
D0-D3
e-STUDIO3511/4511 CONTROL PANEL
System control PC board
Power ON/OFF
Reset signals
LCD
controller
Serial data
LED scan signal
LED serial output
Buzzer ON signal
Fig. 5-403
1/tF
240 1 2
CP x(640/4) pulses
Fig. 5-404
Control panel
Inverter for
backlight
Contrast adjustment
circuit
LCD display
640 x 240 dots
Analog
Touch panel
input
Decoder
Panel
processing
CPU
Hard-key matrix
LED driver
LED
Buzzer
1/tF
240 1 2
5 - 10
240 1 2
November 2003 © TOSHIBA TEC