ST6391 datasheet(47/68 Pages) STMICROELECTRONICS

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D7. This bit is not used

RESPWRLAT. Resets the PWR latch; this bit is set

only.

PWRINTEN. This bit enables the PWRINT signal

(#4) from the latch to the ST639x core. Undefined

after reset.

PWREDGE. The bit determines the edge which

will cause the PWRIN latch to be set. If this bit is

high, than the PWRIN latch will be set on the rising

edge of the PWRIN signal. Undefined after reset.

RESIRLAT. Resets the IR latch; this bit is set only.

IRINTEN. This bit enables the IRINTN signal (#0)

from the latch to the ST639x core. Undefined after

reset.

IRPOSEDGE. The bit determines the edge which

will cause the IR latch to be set. If this bit is high,

than the IR latch will be set on the rising edge of the

IR signal. Undefined after reset.

D0. This bit is not used

DLCR

Dedicated Latches Control

(E9h, Write Only)

D7 D6 D5 D4 D3 D2 D1 D0

Unused

IRPOSEDGE

IRINTEN

RESIRLAT

PWREDGE

PWRINTEN

RESPWRLAT

Unused

Figure 55. Dedicated Latches Control Register

ON-SCREEN DISPLAY (OSD)

The ST639x OSD macrocell is a CMOS LSI char-

acter generator which enable display of characters

and symbols on the TV screen. The character

rounding function enhances the readability of the

characters. The ST639x OSD receives horizontal

and vertical synchronization signal and outputs

screen information via R, G, B and blanking pins.

The main characteristics of the macrocell are listed

below:

Number of display characters: 5 lines by 15

columns.

Number of character types: 128 characters in

two banks of 64 characters. Only one bank

per screen can be used.

Character size: Four character heights (18H,

36H 54H, 72H), two heights are available per

screen, programmable by line.

Character format: 6x9 dots with character

rounding function.

Character colour: Eight colours available pro-

grammable by word.

Display position: 64 horizontal positions by

2/fosc and 63 vertical positions by 4 H

Word spacing: 64 positions programmable

from 2/fosc to 128/fosc.

Line spacing: 63 positions programmable from

4 to 252 H.

Background: No background, square back-

ground or fringe background programmable by

word.

Background colour: Two of eight colours avail-

able programmable by word.

Display output: Three character data output

terminals (R,G,B) and a blank output terminal.

Display on/off: Display data may be pro-

grammed on or off by word or entire screen.

The entire screen may be blanked.

Format Specification

The entire display can be turned on or off through

the use of the global enable bit or the display may

be selectively turned on or off by word. To turn off

the entire display, the global enable bit (GE) should

be zero. If the global enable is one, the display is

controlled by the word enable bits (WE). The global

enable bit is located in the global enable register

and the word enable bit is located in the space

character preceding the word.

DEDICATED LATCHES(Continued)

ST6391,92,93,95,97,99

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