NT68F62 Datasheet, PDF (28/57 Pages) List of Unclassifed Manufacturers – 8-Bit Microcontroller for Monitor (32K Flash MTP Type)

NT68F62
Sync. Mode
Processing
System Default:
S/C = '1' & ENSEL = '1'
Open INTV & clear INTV flag
No
INTV ?
Yes
Delay 132 ms
Set S/C = '0'
Clear VCNTOV & HCNTOV
Open INTV & clear INTV flag
Delay 132 ms
Yes
VCNTOV = '1'
?
No
STAND-BY Mode
Yes
HCNTH = '00'
?
NORMAL Mode
Seperate Sync.
No
Read VCNT|HCNT
Counter Register
Yes
VCNTOV = '1'
?
No
Yes
HCNTH ='00'
?
No
Read VCNT|HCNT
Counter Register
Freq.
Calculating
NORMAL Mode
Composite Sync.
Set S/C = '1' & ENSEL = ''0'
& SELECT TIME INTRVAL
(16.384 or 32.968ms)
Clear VCNTOV & HCNTOV
Delay 2 * TIME INTELVAL
Freq.
Calculating
HCNTH = '00'
?
Yes Off Mode
No
Suspend Mode
1. Extract VCNTL/H 14 bit data
2. 14 bits data * 8 us
= Vsync. time duration
3. Its reciprocal
is Vsync. freq.
Worng Mode
1. Extract HCNTL/H
12 bit data
2. 12 bit data * Vsync. freq.
= Hsync. freq.
or 12 bits data/time interval
(16.382 or 32.968 ms)
3. Its reciprocal
is Hsync. time duration.
Return
Return
Figure 13.6. H & V Sync. Software Control Flow Chart (for reference only)
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