Acer SPECTRUM AL801 Service Manual page 14

II. MAIN SUBROTINE LOOP
Main loop start
Process Power-saving status ( according to below flow-chart result)
Check GMZAN2 IFM status .is change or not.
And check Signal cable status ( cable not connected or not )
** IFM is the register which measured the HSYN & Vsyn status
No
No
Check Auto-config mode flag already been set?
Read Key status and Process on OSD-screen
Monitoring the time-out of osd status ( if no key input persist for
10 sec , the osd time-out counter will trigger )
Yes, IFM have change
Is current system status in Power-saving ?
No
Check the IFM result is in the standard
Mode table ?
No
Check the IFM result is in the user mode
table ?
No
Out of range ( input not support) be
confirm
confirm the frequency ( Hsyn or Vsyn) from IFM already
been changed ? ( check the change mode flag)
Process ( turn off OSD , setting GMZAN2according to
above parameter, set LED status, set backlight status)
Yes
Check Factory mode flag= 1
No
)
Yes
Yes
Yes
Yes , freq had been change
Yes
13
Wake-up GMZAN2
(because GMZAN2 was in
partial sleeping state)
Set mode index & parameter
Set change mode flag
No
Do Auto-config
automatically
if the RS232 buffer is full,
process the command( while
adjust white-balance in factory
mode)