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參數(shù)資料
| 型號(hào)： | P83C270AAR |
| 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, MROM, 12 MHz, MICROCONTROLLER, PDIP52 |
| 文件頁(yè)數(shù)： | 61/80頁(yè) |
| 文件大小： | 266K |
| 代理商： | P83C270AAR |
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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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