GMS84512 Datasheet, PDF (66/123 Pages) Hynix Semiconductor – 8-BIT SINGLE CHIP MICROCOMPUTER

GMS 84512 / 84524
3.8 On Screen Display ( OSD )
3.8.1 OSD Overview
The OSD of GMS84512/84524 can display maxium 128 kinds of character or symbol to CRT screen,
basically GMS84512/84524 incorporates a 22 characters ¡¿3lines CRT display control circuit. If OSD
interrupt is to be used, maxium 12 lines can be displayed.
Especially, GMS84512/84524 is equipped with smoothing function and color edge function.
3.8.2 Feature of OSD
l OSD CLOCK
:
l The Nnmber of Character :
l Display Ability
:
4 §Ö ¡- 8 §Ö
128 characters ( include 2 test characters )
22 Character ¡¿ 3 lines
l Character Size
l Character Color
l Font Configulation
( use OSD Interrupt : enable 12 lines )
: 16 kinds ( every line unit )
: 8 kinds ( every character unit )
: 14 ¡¿18 Dots
l Display Position
l Display MOde
: Horizontal 61 steps, Vertical 128 step (every line unit)
: Character Mode, Background Mode
Color Edge Mode, Blanking Mode
( every line unit )
l Background Size
: Domain of total screen, domain of line unit
l Background and Edge Color : 8 kinds
l Smoothing Function
l OSD Oscillator Control Function
3.8.3 Configuration of OSD
The OSD of GMS84512/84524 is equipped with OSD oscillator, timing circuit, display position
register (HDP1, HDP2, HDP3, VDP1, VDP2, VDP3) display mode register (DMSS1, DMSS2,
DMSS3), display control register (OSDCON1, OSDCON2), character ROM storing 128 kinds of
character font, display RAM (22 character ¡¿ 3 lines) storing font address and color data of
display character and output control circuit.
Fig 3.8.1 is a block of OSD circuit of GMS84512/84524
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