MC141541 데이터 시트보기 (PDF) - Motorola => Freescale

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MC141541

Enhanced Monitor On-Screen Display

Motorola => Freescale 

Table 2. Resolution Setting

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Register Setting (32B)

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Dot Number per H Sync Line

0

1

320

480

ÎÎÎÎÎÎÎÎ1111119876543211043205 ÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÏÏÏÏÏÎÎÎÎÎÎÎÎÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

Bordering

1111119876543211043205ÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÏÏÏÏÏÎÎÎÎÎÎÎÎÏÏÏÏÎÎÎÎÎÎÎÎ

Shadowing

Figure 11. Character Bordering and Shadowing

Frame Format and Timing

Figure 12 illustrates the positions of all display characters

on the screen relative to the leading edge of horizontal and

vertical flyback signals. The shaded area indicates the area

outside the “safe viewing area” for the display characters.

Notice that there are two components in the equations stated

in Figure 12 for horizontal and vertical delays: fixed delays

from the leading edge of HFLB and VFLB signals, regardless

of the values of HORD and VERTD (47 dots + phase detec-

tion pulse width) and one H scan line for horizontal and verti-

cal delays, respectively; and variable delays determined by

the values of HORD and VERTD. Refer to Frame Control

Registers Coln 9 and 10 for the definitions of VERTD and

HORD.

Phase detection pulse width is a function of the external

charge–up resistor, which is the 330 kΩ resistor in a series

with 2 kΩ to VCO pin in the Application Diagram. Dot fre-

quency is determined by the equation H freq x 320 if Bit

X32B is clear, and H freq x 480 if Bit X32B is set to 1 and Bit

X64 is 0. For example, dot frequency is 10.24 MHz if H freq is

32 kHz while Bit X32B is 0. If Bit X32B is 1 and Bit X64 is 0,

the dot frequency will be 15.36 MHz (one and a half of the

original one).

When double character width is selected for a row, only the

even–numbered characters will be displayed, as shown in

Row 2. Notice that the total number of horizontal scan lines in

the display frame is variable, depending on the chosen char-

acter height of each row. Care should be taken while config-

uring each row character height so that the last horizontal

scan line in the display frame always comes out before the

leading edge of VFLB of the next frame, to avoid wrapping

display characters of the last few rows in the current frame

into the next frame. The number of display dots in a horizon-

tal scan line is always fixed at 240, regardless of row charac-

ter width and the setting of Bit X32B.

vertical delay =

VERTD x 4 + 1 H scan lines

VFLB

variable number of H scan lines

ÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏ...ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏ... ÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÏÏÎÎ

Figure 12. Display Frame Format

MC141541

10

MOTOROLA

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