STV9425 STMicroelectronics, STV9425 Datasheet - Page 10

• Manufacturer Part Number: STV9425
• Description: Video ICs On-Screen Disp Montr
• Manufacturer: STMicroelectronics
• Type: Multisync On-Screen Display For Monitorr

Specifications of STV9425

• Maximum Operating Temperature: + 70 C
• Package / Case: DIP-24
• Minimum Operating Temperature: 0 C
• Mounting Style: Through Hole
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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)
Figure 7 : Relation between Screen/Address Page/Character Code in RAM
Figure 8 : User Definable Character
10/15
1
4
36 Pixels (= 3 Characters)
DISP LAY CONTROL Re giste r
AND DES CRIPTORS
ON THE SCREEN
CS D FBK FL[1:0]
2nd CHARACTER
(UDC for e xa mple)
1st CHARACTE R
3rd CHARACTER
DES CRIPTORS )
DES CRIPTORS
S TRIP CODES
S TRIP CODES
S RTIP CODES
(CODES OR
RAM CODE
TABLE OF
OTHER
OTHER
OTHER
2
5
P 8
P 7
3
6
P 8
Character Number
Character Number
TABLE OF THE
DES CRIPTORS
SP ACING
SP ACING
SP ACING
ROW1
ROW2
ROW3
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
scan lines (CH[5:0] given by the CHARACTER
HEIGHT register), the character codes are read at
the addressesstarting from the 1
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.
Slice 0
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
BOTTOM S P ACING S TRIP
(example for Character n 5)
2n d CHARACTER S TRIP
3rd CHARACTER S TRIP
1s t CHARACTER S TRIP
TOP SP ACING S TRIP
S P ACING S TRIP
V-SYNC
IN THE RAM
S CREEN
: 0x01
: 0x00
: 0x08
: 0x0c
: 0x0e
: 0x0f
: 0x0f
: 0x0f
: 0x0f
: 0x0e
: 0x0c
: 0x00
: 0x00
: 0x00
: 0x00
: 0x00
: 0x00
: 0x00
: 0x00
Odd
Address
|
0xff =
0xff
0x7f
0x3f
0x1f
0x1f
0x1f
0x1e
0x1e
0x3c
0x3c
0x78
0x78
0xf1
0x00
0x00
0x00
0x00
0x00
Even
Address
Slice 18 of the character n 2
only for vertical shadowing
(not displayed).
st
one given by the