STV9425 STMicroelectronics, STV9425 Datasheet - Page 7

• 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

FUNCTIONAL DESCRIPTION (continued)
I.3 - Addressing Space
STV9425/25B/26 registers, RAM and ROM are
mapped in a 16Kbytes addressing space. The
mapping is the following :
I.4 - Register Set
LINE DURATION
HORIZONTAL DELAY
DD[7:0] : HORIZONTAL DISPLAY DELAY from
CHARACTERS HEIGHT
CH[5:0] : HEIGHT of the character strips in scan
VSP
HSP
LD[5:0] : LINE DURATION
3FF1 DD7 DD6 DD5 DD4 DD3 DD2 DD1 DD0
3FF0 VSP HSP LD5 LD4 LD3 LD2 LD1 LD0
3FF2
1FFF
3FFF
3FFF
03FF
32FF
3FF0
0000
0400
2000
3300
*
*
*
0
-
-
0
: V-SYNC active edge selection
: H-SYNC active edge selection
the H-SYNC reference falling edge to
the 1
strips. Unit = 3 pixel periods.
lines. For each scan line, the number of
the slice which is displayed is given by :
SLICE-NUMBER =
SCAN-LINE-NUMBER = Number of the
current scan line of the strip.
1024 bytes RAM
= 0 : falling egde, = 1 : rising edge
= 0 : falling egde, = 1 : rising edge
(number of pixel period per line divided
by 12 ie. Unit = 12 pixel periods).
Generator ROM
round
Empty Space
Empty Space
0
-
-
Character
Registers
0
Internal
st
CH5 CH4 CH3 CH2 CH1 CH0
SCAN LINE NUMBER x 18
0
pixel position of the character
0
1
1
0
1
CH[5:0]
Descriptors character
codes user definable
characters
0
1
1
0
0
1
0
1
1
.
0
0
1
DISPLAY CONTROL
OSD
FBK
FL[1:0] : Flashing mode :
P[8:6]
LOCKING CONDITION TIME CONSTANT
FR
AS[2:0] : P h a s e c o n s t ant du rin g lo ck ing
BS[2:0] : Frequency constant during locking
CAPTURE PROCESS TIME CONSTANT
AF[2:0] : Phase constant during the capture
BF[2:0] : Frequency constant during the capture
INITIAL PIXEL PERIOD
PP[7:0] : Value to initialize the pixel period of the
FREQUENCY MULTIPLIER
FM[3:0] : Frequency multiplier of the crystal
3FF4 FR AS2 AS1 AS0
3FF5
3FF6 PP7 PP6 PP5 PP4 PP3 PP2 PP1 PP0
3FF7
3FF3
*
*
*
*
*
0
OSD
0
: ON/OFF (if 0, R, G, B and FBLK are 0).
: Fast blanking control :
: Address of the 1
: Free Running ; if = 1 PLL is disabled and
-
-
-
-
0
= 1 : FBLK = 1, forcing black where these
is no display,
= 0 : FBLK is active only during character
display.
- 00 : No flashing. The character
- 01 : 1/1 flashing (a duty cycle = 50%),
- 10 : 1/3 flashing,
- 11 : 3/1 flashing.
current displayed pages.
P[13:9] and P[5:0] = 0 ; up to 8 different
pages can be stored in the RAM.
the pixel frequency keeps its last value.
conditions.
conditions.
process.
process.
PLL.
frequency to reach the high frequency
used by the PLL to derive the pixel
frequency.
STV9425 - STV9425B - STV9426
attribute is ignored,
AF2
0
0
0
-
-
FBK FL1
0
AF1 AF0
1
1
1
-
-
0
0
-
-
0
1
FL0
0
FM3 FM2 FM1 FM0
st
1
1
-
-
-
-
descriptor of the
-
-
BS2 BS1 BS0
BF2
0
0
0
0
P8
0
BF1
1
1
1
0
P7
0
BF0
7/15
P6
0
1
0
0
0