Z90251 Datasheet, PDF (45/97 Pages) Zilog, Inc. – eZVision 200 Television Controllers with OSD

Z90255 ROM and Z90251 OTP
32 KB Television Controller with OSD
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5.6 Character Generation
Character generation provides the content of the OSD. The Z90255 supports 14-
pixel (horizontal) by 18-pixel (vertical) character display with 512 character sets.
Character Cell Resolution
Characters are mapped pixel-by-pixel in Character Generation Read-Only
Memory (CGROM).
Hex Add
0000 0 0 1 0 0 0 0
0001 0 1 0 0 1 1 0
0002 0 0 0 1 0 0 0
0003 0 1 0 1 1 0 0
0004 0 1 1 1 1 1 0
0005 0 1 0 0 0 0 0
0006 0 0 1 0 1 0 0
0007 0 1 1 1 1 1 0
0008 0 0 1 0 1 0 0
0009 0 0 0 0 0 1 0
000a 0 0 1 0 1 0 0
000b 0 0 0 0 1 0 0
000c 0 1 1 1 1 1 0
000d 0 0 0 0 0 0 0
000e 0 0 0 0 0 0 0
000f 1 1 1 1 1 1 1
0010 0 1 1 1 1 1 0
0011 0 0 0 0 0 0 0
0012 0 1 0 0 0 1 0
0013 0 1 0 0 0 0 0
0014 0 1 1 1 1 1 0
0015 0 1 1 1 1 1 0
0016 0 1 0 0 0 1 0
0017 0 1 0 0 0 0 0
0018 0 1 1 1 1 1 0
0019 0 1 0 0 0 0 0
001a 0 1 0 0 0 1 0
001b 0 1 1 1 1 1 0
001c 0 1 0 0 0 1 0
001d 0 1 0 0 1 0 0
001e 0 1 0 1 0 1 0
001f 0 1 0 0 1 0 0
0020 0 1 0 0 1 1 0
0021 0 1 0 0 0 0 1
0022 0 0 0 0 0 1 0
0023 0 0 1 1 1 1 1
0024
0039
0040 _{Character Pattern}
0063
Left Half
address GAP
Right Half
7fc0
7fa3 ^{Character Pattern}
7fa4
7fbf
7fc0 0 0 0 0 0 0 0
7fc1 0 0 0 0 0 0 0
7fc2 0 0 0 0 0 0 1
7fc3 1 1 0 0 0 0 0
7fc4 0 0 0 0 0 1 0
7fc5 0 0 1 0 0 0 0
7fc6 0 0 0 0 1 0 0
7fc7 0 0 0 1 0 0 0
7fc8 0 0 0 0 1 0 0
7fc9 0 0 0 1 0 0 0
7fca 0 0 0 0 0 1 0
7fcb 0 0 1 0 0 0 0
7fcc 0 0 0 0 0 0 1
7fcd 1 1 0 0 0 0 0
7fce 0 0 0 0 0 0 1
7fcf 0 1 0 0 0 0 0
7fd0 0 0 0 0 0 0 1
7fd1 0 1 0 0 0 0 0
7fd2 0 0 0 1 1 1 1
7fd3 1 1 1 1 1 0 0
7fd4 0 0 0 0 0 0 0
7fd5 0 0 0 0 0 0 0
7fd6 0 0 0 0 0 0 1
7fd7 1 1 0 0 0 0 0
7fd8 0 0 0 0 0 1 0
7fd9 0 0 1 0 0 0 0
7fda 0 0 0 0 1 0 0
7fdb 0 0 0 1 0 0 0
7fdc 0 0 0 0 1 0 0
7fdd 0 0 0 1 0 0 0
7fde 0 0 0 0 0 1 0
7fdf 0 0 1 0 0 0 0
7fe0 0 0 0 0 0 0 1
7fe1 1 1 0 0 0 0 0
7fe2 0 0 0 0 0 0 0
7fe3 0 0 0 0 0 0 0
address GAP
Left Half
Right Half
Figure 12 Character Pixel map in CGROM
Figure 12 is an example of a 512 character set where the character pixel map
represents the first and last characters. It is 14 pixels horizontal and 18 pixels
vertical. Each row in the map is 7 bits long, half the width of the character scan
line.
Even numbered rows in the map correspond to pixels on the left half of the
character scan line; odd rows in the map correspond to pixels on the right half of
the character scan line.
PS001301-0800