GMS84512 Datasheet, PDF (74/123 Pages) Hynix Semiconductor – 8-BIT SINGLE CHIP MICROCOMPUTER

GMS 84512 / 84524
3.8.8 MULTI LINE DISPLAY
The OSD function of GMS84512/84524 is basically enable 3-line display, but if OSD interrupt is
used maximum up to 12 lines can be displayed.
OSD interrupt request occurs when OSDON(bit3 of OSDCON1) is "1" and each line display
finishes, and OSD interrupt happens when OSD interrupt request occurs, at this time I-Flag(bit2 of
PSW) and OSDE(bit7 of IENH(00EA_H)) has to set "1".
OSD Display allows multiple lines(more than 3 lines) to be displayed on the screen by OSD
interrupt, each time one line is displayed and rewriting display RAM data, display position register
(HDPi, VDPi) and display mode register in the OSD interrupt service routine for which display is
terminated.
l 6 Line Display Occasion
¨ç 1'st Line Dispaly
¨è 2'nd Line Dispaly
¨é 3'rd Line Display
¨ê 4'th Line Dispaly
¨ë 5'th LIne Dispaly
¨ì 6'th Ling Dispaly
¡æ _{Load 4'th line data(contents, position, mode) to 1'st}
line RAM and register.
¡æ _{Load 5'th line data(contents, position, mode) to 2'nd}
line RAM and register
¡æ _{Load 6'th line data(contents, position, mode) to 3'rd}
line RAM and register
1’st LINE
1’st Line Display RAM
HDP1, VDP1, DMSS1
3’rd LINE
3’rd Line Display RAM
HDP3, VDP3, DMSS3
2’nd LINE
2’nd Line Display RAM
HDP2, VDP2, DMSS2
FIG. 3.8.6 OSD Display Method
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