p87c770 ETC-unknow, p87c770 Datasheet - Page 61

• Manufacturer Part Number: p87c770
• Description: Microcontrollers Ntsc With On-screen Display Closed Caption
• Manufacturer: ETC-unknow

Philips Semiconductors
18.10.2 ROM
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.
1999 Jun 11
handbook, halfpage
handbook, full pagewidth
Microcontrollers for NTSC TVs with On-Screen
Display (OSD) and Closed Caption (CC)
character X
character X
12 bits
Fig.25 Character ROM organisation.
A
B
C
D
0
1
2
3
4
5
6
7
8
9
E
F
ADDRESSING
1
word address = C000H
word address = (X
word address = [(X
X = 0, 1, 2, 3,....
0
MGL155
1/2
™
®
1
¿
¢
£
à
_
è
â
ê
ô
û
˚
î
16)
1)
SP
%
&
+
2
#
$
á
"
´
,
-
.
!
(
)
/
16]
C000H
C000H
Character code columns (bits 4 to 7)
<
=
>
3
0
1
2
3
4
5
6
7
8
9
?
:
;
Fig.27 Character table.
@
G
M
O
A
B
C
D
E
F
H
K
N
4
J
L
I
61
handbook, halfpage
W
Q
R
U
5
P
S
T
V
X
Y
Z
ó
é
[
]
Í
Fig.26 Character ROM organization for
columns 8 and 9.
m
6
ú
a
b
d
e
g
h
n
o
c
k
f
i
j
l
character X
character X
plane 0
plane 1
12 bits
w
Ñ
7
p
q
u
ñ
n
s
v
x
y
z
ç
r
t
word address = C000H
word address = (X
word address = [(X + 1)
X = 0, 2, 4,....
MGL156
8 (B)
P8xCx70 family
9 (C)
Product specification
16) + C000H
A (D)
MGR275
16] + C000H