STV9423 Ver la hoja de datos (PDF) - STMicroelectronics
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STV9423 Datasheet PDF : 15 Pages
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STV9422 - STV9424
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).
If 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 addresses starting 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 proc-
ess is repeateduntilthe next falling edgeon V-SYNC.
Figure 7 : Relation between Screen/Address Page/Character Code in RAM
DISPLAY CONTROL Register
CSD FBK FL[1:0]
P8 P7 P8
V-SYNC
2nd CHARACTER
STRIP CODES
OTHER
TABLE OF
DESCRIPTORS
OTHER
(UDC for example)
1st CHARACTER
STRIP CODES
3rd CHARACTER
SRTIP CODES
OTHER
(CODES OR
DESCRIPTORS)
RAM CODE
AND DESCRIPTORS
Figure 8 : User Definable Character
ON THE SCREEN
36 Pixels (= 3 Characters)
1
2
4
5
SPACING
ROW1
ROW2
SPACING
ROW3
SPACING
TABLE OF THE
DESCRIPTORS
TOP SPACING STRIP
1st CHARACTER STRIP
2nd CHARACTER STRIP
SPACING STRIP
3rd CHARACTER STRIP
|
BOTTOM SPACING STRIP
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
10/15
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