STV9425-STV9425B 查看數據表（PDF） - STMicroelectronics
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STV9425-STV9425B Datasheet PDF : 15 Pages
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STV9425 - STV9425B - STV9426
FUNCTIONAL DESCRIPTION (continued)
After the falling edge on V-SYNC, the first strip
descriptor is read at the top of the current table of
descriptors at the address given by P[9:0] (see
DISPLAY CONTROL register).I
f it is a spacing strip, SL[7:0] black or transparent
scan lines are displayed.
If it is a character strip, during CH[5:0] x (I + ZY)
scan lines (CH[5:0] given by the CHARACTER
HEIGHT register), the character codes are read at
the addressesstarting from the 1st one given by the
descriptor until a end of line character or the end of
the scan line.
The next descriptor is then read and the same
process is repeated until the next falling edge on
V-SYNC.
Figure 7 : Relation between Screen/Address Page/Character Code in RAM
DISP LAY CONTROL Re giste r
CS D FBK FL[1:0]
P8 P7 P8
V-S YNC
2nd CHARACTER
S TRIP CODES
OTHER
TABLE OF
DES CRIPTORS
O THE R
(UDC for e xa mple)
1st CHARACTE R
S TRIP CODES
3rd CHARACTER
S RTIP CODES
OTHER
(CODES OR
DES CRIPTORS )
RAM CODE
AND DES CRIPTORS
Figure 8 : User Definable Character
ON THE SCREEN
36 Pixels (= 3 Characters)
1
2
4
5
10/15
SP ACING
ROW1
ROW2
SP ACING
ROW3
SP ACING
TABLE OF THE
DES CRIPTORS
TOP SP ACING S TRIP
1s t CHARACTER S TRIP
2n d CHARACTER S TRIP
S P ACING S TRIP
3rd CHARACTER S TRIP
|
BOTTOM S P ACING S TRIP
SCREEN
3 Character Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
6 Character Number
IN THE RAM
(example for Character n°5)
Slice 0 : 0x01
Slice 1
Slice 2
Slice 3
Slice 4
Slice 5
Slice 6
Slice 7
Slice 8
Slice 9
Slice 10
Slice 11
Slice 12
Slice 13
Slice 14
Slice 15
Slice 16
Slice 17
Slice 18
: 0x00
: 0x08
: 0x0c
: 0x0e
: 0x0f
: 0x0f
: 0x0f
: 0x0f
: 0x0e
: 0x0c
: 0x00
: 0x00
: 0x00
: 0x00
: 0x00
: 0x00
: 0x00
: 0x00
Odd
Address
0xff = Slice 18 of the character n°2
only for vertical shadowing
(not displayed).
0xff
0x7f
0x3f
0x1f
0x1f
0x1f
0x1e
0x1e
0x3c
0x3c
0x78
0x78
0xf1
0x00
0x00
0x00
0x00
0x00
Even
Address
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