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參數(shù)資料
| 型號： | P87C770AAR |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Microcontrollers for NTSC TVs with On-Screen Display OSD and Closed Caption CC |
| 中文描述： | 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PDIP52 |
| 文件頁數(shù)： | 60/80頁 |
| 文件大?。?/td> | 266K |
| 代理商： | P87C770AAR |
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1999 Jun 11
60
Philips Semiconductors
Product specification
Microcontrollers for NTSC TVs with On-Screen
Display (OSD) and Closed Caption (CC)
P8xCx70 family
18.10 Character font format
The character font is a 12 (horizontal) x 13 (vertical)
matrix. The ROM contents have two extra lines in each
field to facilitate the fringing function when groups of
characters are used to build symbols.
A table with 128 characters, two columns of special
characters (32) and a column for proportional spaced
characters (16) is shown in Fig.27.
The ROM size is 176 characters x 12
×
16 = 33792 bits
(4224 bytes, 2816 x 12-bit words).
18.10.1 C
HARACTER
ROM
FORMAT
The character addressing scheme is dependent on what
type of character is accessed. Therefore, the ROM format
for the different columns changes respectively.
The ROM format is 16 locations in words of 12 bits, where
the MSB (bit 11) of the ROM word is the left most pixel of
a character displayed.
The lines 0 and 14 are used for fringing of clustered
characters (single images using more than one character)
over row boundaries. Lines 1 to 13 contain the font of the
character and line 15 is not used.
The proportional spaced characters use only bits 11 to 6
for display. Bits 5 to 0 are defined by repeating the
information held in bits 11 to 6 shifted up one line.
The ROM definition for these characters is shown in
Fig.24. Proportional characters can be displayed in
column A only.
The ROM format for the special characters uses two
subsequent character ROM locations. The character
definition will always start with an even character.
This location holds the information for bit Plane 0 the next
location (odd) contains the bit Plane 1. No shadowing is
supported when using these characters. The bit
combinations of Plane 0 and Plane 1 define which colour
is displayed for a certain pixel. A detailed description on
how these characters are displayed is found in
Section 18.2.16.
The ROM format for each plane is defined as stated for the
normal characters, except that the data on the fringing
lines is ignored.
Fig.23 Character ROM format columns 0 to 7.
handbook, halfpage
line
number
line 13 from
character above
line 0 from
character below
top left
pixel
MSB
LSB
MGL153
HEX
440
003
00C
030
0C0
300
C00
C00
300
0C0
030
00C
003
000
198
000
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
fringing
top line
bottom right
pixel
bottom line
fringing
line not used
Fig.24 Proportional character ROM format
column A.
handbook, halfpage
number
0 (LSB)
5
6
11 (MSB)
fringe
(1)
MGL154
HEX
value
000
000
00C
300
00C
30C
30C
30C
30C
30C
306
180
000
000
000
000
fringe
(3)
not used
fringe
(2)
not used
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
(1) Line 13 from character above.
(2) Line repeated from line 14 (bits 11 to 6).
(3) Line 1 from character below.
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