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STV9421 bảng dữ liệu(PDF) 7 Page - STMicroelectronics

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FUNCTIONAL DESCRIPTION (continued)
I.3 - Addressing Space
STV9420/21registers, RAM and ROM are mapped
in a 16Kbytes addressing space. The mapping is
the following :
0000
Descriptors character
codes user definable
characters
1024 bytes
RAM
03FF
0400
Empty
Space
1FFF
2000
Character
Generator
ROM
32FF
3300
Empty
Space
3FFF
3FF0
Internal
Registers
3FFF
I.4 - Register Set
LINE DURATION
3FF0
-
-
LD5
LD4
LD3
LD2
LD1
LD0
*
-
-
11111
1
LD[5:0] : LINE DURATION (number of character
period, 1LSB = 12 pixel periods).
HORIZONTAL DELAY
3FF1
DD7 DD6 DD5 DD4 DD3 DD2 DD1 DD0
*
0
0
00100
0
DD[7:0] : HORIZONTAL DISPLAY DELAY from
the H-SYNC reference falling edge to
the 1
st pixel position of the character
strips.
Unit = 3 pixel periods.
CHARACTERS HEIGHT
3FF2
-
-
CH5 CH4 CH3 CH2 CH1 CH0
*
-
-
01001
0
CH[5:0] : HEIGHT of the character strips in scan
lines. For each scan line, the number of
the slice which is displayed is given by :
SLICE-NU MBER
=
round
SCAN
±LINE±NUMBER x 18
CH[5:0]
SCAN-LINE-NUMBER = Number of the current scan
line of the strip.
DISPLAY CONTROL
3FF3
OSD FBK
FL1
FL0
-
P8
P7
P6
*
0
000
-
0
00
OSD
: ON/OFF (if 0, R, G, B and FBLK are 0).
FBK
: Fast blanking control :
= 1 : FBLK = 1, forcing black where
these is no display,
= 0 : FBLK isactive onlyduring
character display.
FL[1:0] : Flashing mode :
- 00 : No flashing. The character
attribute is ignored,
- 01 : 1/1 flashing (a duty cycle = 50%),
- 10 : 1/3 flashing,
- 11 : 3/1 flashing.
P[8:6]
: Address of the 1
st descriptor of the
current displayed pages.
P[13:9] and P[5:0] = 0 ; up to 8 different
pages can be stored in the RAM.
LOCKING CONDITION TIME CONSTANT
3FF4
FR
AS2 AS1 AS0
-
BS2 BS1 BS0
*
0
010
-
0
10
FR
: Free Running ; if = 1 PLL is disabled and
the pixel frequency keeps its last value.
AS[2:0] : Ph a s e co n st a n t d ur i n g l o c ki n g
conditions.
BS[2:0] : Frequency constant during locking
conditions.
CAPTURE PROCESS TIME CONSTANT
3FF5
-
AF2
AF1
AF0
-
BF2
BF1
BF0
*
-
011
-
0
11
AF[2:0] : Phase constant during the capture
process.
BF[2:0] : Frequency constant during the capture
process.
INITIAL PIXEL PERIOD
3FF6
PP7 PP6 PP5 PP4 PP3 PP2 PP1 PP0
*
0
01010
00
PP[7:0] : Value to initialize the pixel period of the
PLL.
FREQUENCY MULTIPLIER
3FF7
-
-
-
-
FM3 FM2 FM1 FM0
*
---
-
1
0
1
0
FM[3:0] : Frequency multiplier of the crystal
frequency to reach the high frequency
used by the PLL to derive the pixel
frequency.
STV9420 - STV9421
7/16


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