MTV118 Ver la hoja de datos (PDF) - Myson Century Inc

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MTV118

On-Screen-Display for LCD Monitor

Myson Century Inc 

MYSON

TECHNOLOGY

MTV118

3.6 User Font RAM

The user font RAM has 288 locations which are allocated between row 0/column 0 and row 7/column

35 to specify 8 user-programmable fonts, as shown in Figure 5. Each programmable font consists of a

12x18 dot matrix. Each row of dot matrix consists of 2 bytes of data which include 4 dummy bits as

shown in figure 6. That is, the dot matrix data of each font is stored in 36-byte registers. For example,

font 0 is stored in row 0 from column 0 to column 35 and font 1 is stored in row 1 from column 0 to col-

umn 35, etc.

ROW #

01

0

1

COLUMN #

34 35 36

63

USER FONT RAM

RESERVED

6

7

FIGURE 5. User Font RAM Memory Map

Nth byte

(N+1)th byte

leftmost dot of font

rightmost dot of font

b7 b6 b5 b4 b3 b2 b1 b0 b7 b6 b5 b4 b3 b2 b1 b0

12 bits for 1-row data of font dot matrix

Dummy bits

N=even number

FIGURE 6. Data Format of Font Dot Matrix

3.7 Character ROM

The character ROM contains 248 built-in characters and symbols from addresses 0 to 247. Each char-

acter and symbol consists of a 12x18 dot matrix. The detail pattern structures for each character and

symbol are shown in 10.0“CHARACTER AND SYMBOL PATTERN” on page 15.

3.8 Luminance & Border Generator

There are 2 shift registers included in the design which can shift out of luminance and border dots to the

color encoder. The bordering and shadowing feature is configured in this block. For bordering effect,

the character will be enveloped with blackedge on 4 sides. For shadowing effect, the character is envel-

oped with blackedge on right and bottom sides only.

3.9 Window and Frame Control

The display frame position is completely controlled by the contents of VERTD and HORD. The window

size and position control are specified in columns 0 to 11 on row 15 of the memory map, as shown in

Figure 4. Window 1 has the highest priority and window 4 has the least, when 2 windows are overlap-

ping. More detailed information is described as follows:

8/15

MTV118 Revision 2.0 01/01/1999

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