Z90102 Datasheet, PDF (14/36 Pages) Zilog, Inc. – 40-Pin Low-Cost Digital Television Controller

Z90102/90103/90104
40-Pin Low-Cost Digital Television Controller
Zilog
FUNCTIONAL DESCRIPTION (Continued)
The OSD features are as follows:
s Character Color: Seven kinds of color are specified on
a row basis.
s Character Pixel Size: Four character pixel sizes are
selected for a high resolution (1HL, 2HL, 3HL, and 4HL)
Horizontal Line (HL).
s Polarity Selections: Can select active low or high for
horizontal/vertical sync input and RGB outputs.
s Display Position: Can display 64 vertical positions by
4HL units and 64 horizontal positions by a 4-dot clock.
s Inter Row Spacing: Inter row vertical line spacing is set
from 2HL to 17HL.
s Fade In/Out Control: Fade position can be determined
in vertical direction.
s Bar Line Type Display: One of the rows is selected to
display an analog bar line every half column by setting
second color with proper character set.
s Fringe Function: Fringe off/on and the color selected.
s Background Color: Eight kinds of color including black
background color.
s ON/OFF Control: Character display, backgrounds are
turned on and off.
s Number of Display Characters: 6 rows x 20 columns.
s Character Set: 96 (11 x 15 dots).
Character Generator ROM. The character generator
ROM is organized as 3 KB of six bits. The ROM defines ei-
ther 11 x 15 dot (high resolution)
characters. LDE or LDEI instructions are required to ac-
cess the Video RAM (Figure 11).
Hex
Address
FD00
FD01
FD02
FD13
FD14
Row 1 Attribute (ROW1_ATTR)
Row 1 Column 1 Character Data
Row 1 Column 2 Through
Column 19 Character Data
Row 1 Column 20 Character Data
FD20
FD21
FD22
FD33
FD34
Row 2 Attribute (ROW2_ATTR)
Row 2 Column 1 Character Data
Row 2 Column 2 Through
Column 19 Character Data
Row 2 Column 20 Character Data
FD40
FD54
FD60
FD74
FD80
FD94
FDA0
FDB4
Row 3 Video RAM Buffer
Row 4 Video RAM Buffer
Row 5 Video RAM Buffer
Row 6 Video RAM Buffer
MSB
(7 Bits Wide)
LSB
Figure 11. Video RAM Configuration
Video RAM. The Video RAM is organized as 8-row arrays
(21 x 7 bits each, Figure 11). The first location of each row
array contains the attribute for that row. Row attributes in-
clude programmable character color, row background col-
or and control for background off/on. The next 20 bytes
contain row character data. Each character byte contains
the ASCII code in order to select one of the 96 displayable
14
DS97TEL1902