MYSON

TECHNOLOGY

MTV312M64

(Rev 0.95)

Revision 0.95

- 11 -

2001/07/03

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 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 can generate 4 display patterns, which are 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.