MC141543 데이터 시트보기 (PDF) - Motorola => Freescale
부품명
상세내역
제조사
MC141543 Datasheet PDF : 14 Pages
| |||
In order to have better character display within windows, it
is suggested that the designed character font be placed in
the center of the 10 x 16 matrix with equal space on all four
sides. The character $00 is predefined for blank characters,
the character $7F is predefined for full–filled characters, and
the character $7E is a random dot pattern reserved for test-
ing.
In order to avoid submersion of displayed symbols or char-
acters into a background of comparable colors, a feature of
bordering which encircles all four sides, or shadowing which
encircles only the right and bottom sides of an individual dis-
play character, are provided. Figure 7 shows how a character
is jacketed differently. To make sure that a character is bor-
dered or shadowed correctly, at least one blank dot should
be reserved on each side of the character font.
ÎÎÎÎÎÎÎÎ1111119876543211043205 ÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÏÏÏÏÏÎÎÎÎÎÎÎÎÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
Bordering
1111119876543211043205ÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÏÏÏÏÎÎÎÎÎÎÎÎÏÏÏÏÎÎÎÎÎÎÎÎ
Shadowing
Figure 7. Character Bordering and Shadowing
Frame Format and Timing
Figure 8 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 “safe viewing area” for the display characters. Notice
that there are two components in the equations stated in Fig-
ure 8 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 detection
pulse width) and one H scan line for horizontal and vertical
delays, respectively; and variable delays determined by the
values of HORD and VERTD. Refer to Frame Control Reg-
isters 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, and H freq x 640 if both Bit X32B and Bit X64 are
set to 1. 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). If Bit X32B is 1 and Bit X64 is also 1, the dot
frequency will be 20.48 MHz (double of the original one).
vertical delay =
VERTD x 4 + 1 H scan lines
VFLB
variable number of H scan lines
ÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏ...ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏ... ÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÎÎÏÏÎÎ
Figure 8. Display Frame Format
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 300, regardless of row charac-
ter width and the setting of Bits X32B and X64.
MOTOROLA
MC141543
9
Share Link: 