– 39 –
Automatic Bright Level Adjustment Program
Time Base signal
at CPU pin 26 is High ?
Preset BUS Data Outputs to eliminate beam
current: BRIGHTNESS 0/127*
1
, CONTRAST 0/64
Read A/D Input Voltage at CPU pin 30
*
1
... 0/127 = 0/63 for Bright Level Adju 0/64 for Customer Control
A/D Input Voltage
is in the range*
2
?
Memorize A/D Input Voltage(Standard Voltage (A))
Change BUS Data Outputs for AUTO mode:
BRIGHTNESS 50/127*
3
, CONTRAST 64/64
Read A/D Input Voltage at CPU pin 30
A/D Input Voltage*
4
< (A)-(20/128Vcc)
Increase 1 step (1/63) of BUS Data Output for
Bright Level Adjustment
Memorize Bright Level
Exit Automatic Adjustment mode
(Error)
YES
NO
YES
YES
NO
NO
Enter Automatic Adjustment mode
(Error)
Wait for 100 msec
Wait for 1 sec
Wait for 200 msec
Wait for 70 msec
*
2
... range is between 21/128 Vcc (0.82V) and Vcc (5.0 V)
*
3
... 50/127 = 0/63 for Bright Level Adju 50/64 for Customer Control
*
4
... A/D Input Voltage { [Standard Voltage (A)] - [20/128 Vcc (0.39 V)] }
