參數(shù)資料
型號: P83C270
廠商: NXP Semiconductors N.V.
英文描述: Microcontrollers for NTSC TVs with On-Screen Display (OSD) and Closed Caption (CC)(在NTSC TV中應(yīng)用的具有屏幕顯示和字幕關(guān)閉特點(diǎn)的微控制器)
中文描述: 微控制器用于NTSC電視的屏幕顯示(OSD)和字幕(CC)的(在NTSC電視中應(yīng)用的具有屏幕顯示和字幕關(guān)閉特點(diǎn)的微控制器)
文件頁數(shù): 61/80頁
文件大小: 266K
代理商: P83C270
1999 Jun 11
61
Philips Semiconductors
Product specification
Microcontrollers for NTSC TVs with On-Screen
Display (OSD) and Closed Caption (CC)
P8xCx70 family
18.10.2 ROM
ADDRESSING
Figures 25 and 26 illustrate the addressing schemes used to access the different character formats. Figure 25 shows the
ROM organization of the normal and proportional spaced characters and Fig.26 shows the ROM organization of the
special characters. The address calculation in on the basis of word access. If the CPU accesses the ROM, a two byte
access must be performed to capture the data, the data format is according to the definition in Fig.19.
Fig.25 Character ROM organisation.
handbook, halfpage
character X
word address = C000H
word address = (X
×
16)
+
C000H
word address = [(X
+
1)
×
16]
+
C000H
X = 0, 1, 2, 3,....
MGL155
character X
+
1
Fig.26 Character ROM organization for
columns 8 and 9.
handbook, halfpage
character X
plane 0
word address = C000H
word address = (X
×
16) + C000H
word address = [(X + 1)
×
16] + C000H
X = 0, 2, 4,....
12 bits
MGL156
character X
plane 1
Fig.27 Character table.
handbook, full pagewidth
MGR275
0
1
2
3
4
5
6
7
8
9
A
B
C
D
0
1
1/2
2
3
0
4
@
5
P
6
ú
7
p
8 (B)
9 (C)
A (D)
SP
!
"
#
1
2
3
4
A
B
C
D
Q
R
S
T
U
V
a
b
c
d
q
r
s
t
$
%
&
(
)
á
+
,
-
.
/
5
6
E
F
e
f
g
u
v
E
F
7
8
9
:
;
<
=
>
G
H
I
J
K
L
M
W
X
Y
Z
[
é
]
w
x
y
z
à
_
è
a
ê
h
i
j
k
l
m
N
O
í
n
o
n
ó
Character code columns (bits 4 to 7)
C
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