Mcu Circuit - NEC MultiSync 20WGX2 Series Service Manual

6. MCU Circuit

The source voltage for I325 is 5V, and the system clock frequency is 11.0529MHz.
6.1 Detection of POWER Status
Power key and RC IR can on/off the system.
6.2 Display Mode Identification
6.2.1Functions
(1) Display mode identification
The display mode of input signal is identified based on Table 1.
●
When the mode has been identified through the measurement of horizontal and vertical frequencies,
●
the total number of lines is determined with a formula where Horizontal frequency / Vertical frequency
= Total number of lines. Initial identification can be made by examining the coincidence of the obtained
figure with the number of lines for the mode identified from the frequency.
When the detected frequency if the sync signal has changed, the total number of lines should be
●
counted even through it is rge identified frequency in the same mode.
(2) Power saving mode.
This power saving mode is assumed when the frequency of the horizontal and vertical signal is as
specified below.
7- 3