MTV038N Просмотр технического описания (PDF) - Myson Century Inc

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MTV038N

On-screen-display controller for CRT/LCD monitor

Myson Century Inc 

MYSON

TECHNOLOGY

MTV038

(Revision 1.1)

acters and the remaining dots for blank region. The horizontal delay starting from HFLB leading edge is calcu-

lated with the following equation,

For CRT: Horizontal delay time = ( HORD * 6 + 49) * P - phase error detection pulse width

Where P = One pixel display time = One horizontal line display time / (HORR*12)

For LCD: Horizontal delay time = ( HORD * 6 + 49) * P

Where P = 1 XIN pixel display time

3.5 Phase lock loop (PLL)

On-chip PLL generates system clock timing (VCLK) by tracking the input HFLB and horizontal resolution reg-

ister (HORR). The frequency of VCLK is determined by the following equation:

VCLK Freq = HFLB Freq * HORR * 12

The VCLK frequency ranges from 6MHz to 150MHz selected by (VCO1, VCO0). In addition, when HFLB input

is not present to MTV038, the PLL will generate a specific system clock, approximately 2.5MHz, by a built-in

oscillator to ensure data integrity.

3.6 Display & Row control registers

The internal RAM contains display and row control registers. The display registers have 450 locations which

are allocated between (row 0, column 0) to (row 14, column 29), as shown in Figure 4 and Figure 5. Each dis-

play register has its corresponding character address on ADDRESS byte, its corresponding background color,

button box format, 1 blink bit and its corresponding color bits on ATTRIBUTE bytes. The row control register is

allocated at column 30 for row 0 to row 14 of attribute bytes, it is used to select background color or button box

and set character size to each respective row. If double width character is chosen, only even column charac-

ters could be displayed on screen and the odd column characters will be hidden.

ROW #

01

0

1

13

14

COLUMN #

28 29

30

31

CHARACTER ADDRESS BYTES

of DISPLAY REGISTERS

R

E

S

ROW

ATTRIBUTE

E

R

CRTL REG V

E

D

FIGURE 4. Address Bytes of Display Registers Memory Map

Revision 1.1

-7-

2001/8/21

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