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MYSON
TECHNOLOGY
MTV230M
(Rev 1.0)
Revision 1.0
- 10 -
2000/11/15
6.2.1 H-Freq Table
Output Value (14 bits)
H-Freq(KHZ)
12MHz OSC (hex / dec)
1
31.5
0FDEh / 4062
2
37.5
0D54h / 3412
3
43.3
0B8Bh / 2955
4
46.9
0AA8h / 2728
5
53.7
094Fh / 2383
6
60.0
0854h / 2132
7
68.7
0746h / 1862
8
75.0
06AAh / 1706
9
80.0
063Fh / 1599
10
85.9
05D1h / 1489
11
93.8
0554h / 1364
12
106.3
04B3h / 1203
6.2.2 V-Freq Table
Output value (12bits)
V-Freq(Hz)
12MHz OSC (hex / dec)
1
56
45Ch / 1116
2
60
411h / 1041
3
70
37Ch /
892
4
72
364h /
868
5
75
341h /
833
6
85
2DFh /
735
6.3 H/V Present Check
The Hpresent function checks the input HSYNC pulse, Hpre flag is set when HSYNC is over 10KHz or
cleared when HSYNC is under 10Hz. The Vpresent function checks the input VSYNC pulse, the Vpre flag is
set when VSYNC is over 40Hz or cleared when VSYNC is under 10Hz. The HPRchg interrupt is set when
the Hpre value changes. The VPRchg interrupt is set when the Vpre/CVpre value changes. However, the
CVpre flag interrupt may be disabled when S/W disables the composite function.
6.4 H/V Polarity Detect
The polarity functions detect the input HSYNC/VSYNC high and low pulse duty cycle. If the high pulse
duration is longer than that of the low pulse, the negative polarity is asserted; otherwise, positive polarity is
asserted. The HPLchg interrupt is set when the Hpol value changes. The VPLchg interrupt is set when the
Vpol value changes.
6.5 Output HBLANK/VBLANK Control and Polarity Adjust
The HBLANK is the mux output of HSYNC and composite Hpulse. The VBLANK is the mux output of
VSYNC and CVSYNC. The mux selection and output polarity are S/W controllable.
6.6 VSYNC Interrupt
The MTV230M checks the VSYNC input pulse and generates an interrupt at its leading edge. The VSYNC
flag is set each time when MTV230M detects a VSYNC pulse. The flag is cleared by S/W writing a "0".
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