MYSON
TECHNOLOGY
MTV312M64
(Rev 0.99)
Revision 0.99
- 11 -
2001/07/26
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, and the Hpre flag is set when HSYNC is over 10KHz
or cleared when HSYNC is under 10Hz. The Vpresent function checks the input VSYNC pulse, and 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 change.
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, composite Hpulse and self-test horizontal pattern. The VBLANK
is the mux output of VSYNC, CVSYNC and self-test vertical pattern. The mux selection and output polarity
are S/W controllable.
The VBLANK output is cut off when VSYNC frequency is over 250Hz.
The
HBLANK/VBLANK shares the output pin with P4.1/ P4.0.
6.6 Self Test Pattern Generator
For testing purposes, this generator is able to generate 4 display patterns, namely positive cross-hatch,
negative cross-hatch, full white, and full black (shown as figures below). The HBLANK output frequency of
the pattern can be chosen to 95.2KHz, 63.5KHz, 47.6KHz and 31.75KHz. The VBLANK output frequency of
the pattern is 72Hz or 60Hz. It is originally designed to support monitor manufacturer to do burn-in test, or
offer end-user a reference to check the monitor. The output STOUT of the generator shares the output pin
with P4.2.
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