STV9427 datasheet(9/20 Pages) STMICROELECTRONICS

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CHARACTERS HEIGHT (Reset Value : 24h)

3FF3

CH5 CH4 CH3 CH2 CH1 CH0

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-NUMBER =

round







SCAN

−LINE−NUMBER x 18

CH[5:0]







SCAN-LINE-NUMBER = Number of the current

scan line of the strip.

DISPLAY CONTROL (Reset Value : 00h)

3FF4 OSD FBK

FL1

FL0

OSD

: ON/OFF (if 0, R, G, B and FBLK outputs are 0).

FBK

: Fast blanking control :

= 1, forces FBLK pin at "1" outside and inside the

OSD area. This leads to blank video RGB and

to only display OSD RGB.

= 0, FBLK pin is driven according character code

for normal display of OSD data.

FL[1:0] : Flashing mode :

- 00 : No flashing.

The character attribute is ignored,

- 01 : Flashing at fF (50% duty cycle),

- 10 : Flashing at 2 fF,

- 11 : Flashing at 4 fF.

Note : fF is 128 time vertical frequency.

P[9:6]

: Address of the 1

st descriptor of the current

displayed pages.

P[13:10] and P[5:0] = 0 ; up to 16 different pages

can be stored in the RAM.

LOCKING CONDITION TIME CONSTANT

(Reset Value : 01h)

3FF5

AS2 AS1 AS0 LUK BS2 BS1 BS0

: Free Running ; if = 1 PLL is disabled and the pixel

frequency keeps its last value.

AS[2:0] : Phase constant during locking conditions.

BS[2:0] : Frequency constant during locking conditions.

LUK

: Lock unlock status bit

0 = unlocked PLL

1 = Locked PLL

CAPTURE PROCESS TIME CONSTANT

(Reset Value : 24h)

3FF6 LEN AF2

AF1

AF0

BF2 BF1

BF0

LEN

: Lock enable

0 = R,G,B, FBLK are always enabled,

1 = R,G,B, FBLK are enabled only when PLL is

locked.

AF[2:0] : Phase constant during the capture process.

BF[2:0] : Frequency constant during the capture process.

INITIAL PIXEL PERIOD (Reset Value : 28h)

3FF7 PP7

PP6

PP5

PP4

PP3 PP2 PP1 PP0

PP[7:0] : Value to initialize the pixel period of the PLL.

FREQUENCY MULTIPLIER (Reset Value : 0Ah)

3FF8

----

FM3 FM2 FM1 FM0

FM[3:0] : Frequency multiplier of the crystal frequency to

reach the high frequency used by the PLL to

derive the pixel frequency.

Note : For high pixel frequency (over 70MHz), write at address 3FFF,

Data F0h.

II - Descriptors

SPACING

MSB

L/C

------

LSB

SL7

SL6

SL5

SL4

SL3

SL2

SL1

SL0

L/C

: LINE or CHARACTER spacing :

= 0, spacing descriptor defined as character

height (SL[7:0] = 1 to 255 character).

= 1, spacing descriptor defined as scan line

height (SL[7:0] = 1 to 255 scan lines).

SL[7:0] : Number of selected height (character or scan

lines according L/C).

CHARACTER

MSB

DE CLU3 CLU2 CLU1 CLU0 C9

LSB

C5C4C3

UEN

: Display enable :

= 0, R = G = B = 0 and FBLK = FBK bit of display

control register on the whole strip,

= 1, display of the characters.

CLU[3:0] : Active color selection at the begining of the

strip.

C[9:1]

: Address of the first character code of the strip.

UEN

: UDC enable

0 : codes 240 to 254 (FOh to FEh) are read in

ROM,

1 : codes 240 to 255 (FOh to FFh) are read in

RAM (UDC).

FUNCTIONAL DESCRIPTION (continued)

STV9427 - STV9428 - STV9429

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