NT68P61A Datasheet, PDF (31/48 Pages) List of Unclassifed Manufacturers – 8-Bit Microcontroller for Monitor (24K OTP ROM Type)

NT68P61A
Sync. Mode
Processing
System Default:
S/C = '1' & HSEL = '1'
Open INTV & clear INTV flag
No
INTV ?
Yes
Delay 31 ms
Set S/C = '0'
Clear VCNTOV & HCNTOV
Open INTV & clear INTV flag
Delay 60ms
Yes
VCNTOV = '1'
?
No
STAND-BY Mode
Yes
HCNTH = '00'
?
NORMAL Mode
No
Seperate Sync.
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' & HSEL = '0'
Clear VCNTOV & HCNTOV Delay 10ms
Freq.
Calculating
HCNTH = '00'
?
Yes Off Mode
No
Suspend Mode
1. Extract VCNTL/H 12 bit data
2. HSEL = '1'
12 bit data X 8µs
= Vsync. time duration
3. Its reciprocal
is Vsync. freq.
4. HSEL = '0'
12 bit data X 8.192ms
= Vsync. freq.
Worng Mode
1. Extract HCNTL/H 12 bit data
2. 12 bit data * Vsync. freq.
= Hsync. freq.
3. Its reciprocal
is Hsync. time duration.
Return
Return
Figure 19. H & V Sync. Software Control Flowchart (for reference only)
31