z90102 ZiLOG Semiconductor, z90102 Datasheet - Page 14

• Manufacturer Part Number: z90102
• Description: 40-pin Low-cost Digital Television Controller
• Manufacturer: ZiLOG Semiconductor

FUNCTIONAL DESCRIPTION (Continued)
Z90102/90103/90104
40-Pin Low-Cost Digital Television Controller
The OSD features are as follows:
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)
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
Character Color: Seven kinds of color are specified on
a row basis.
Character Pixel Size: Four character pixel sizes are
selected for a high resolution (1HL, 2HL, 3HL, and 4HL)
Horizontal Line (HL).
Polarity Selections: Can select active low or high for
horizontal/vertical sync input and RGB outputs.
Display Position: Can display 64 vertical positions by
4HL units and 64 horizontal positions by a 4-dot clock.
Inter Row Spacing: Inter row vertical line spacing is set
from 2HL to 17HL.
Fade In/Out Control: Fade position can be determined
in vertical direction.
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.
Fringe Function: Fringe off/on and the color selected.
Background Color: Eight kinds of color including black
background color.
ON/OFF Control: Character display, backgrounds are
turned on and off.
Number of Display Characters: 6 rows x 20 columns.
Character Set: 96 (11 x 15 dots).
characters. LDE or LDEI instructions are required to ac-
cess the Video RAM (Figure 11).
Address
Figure 11. Video RAM Configuration
FD20
FD21
FD22
FD33
FD34
FDA0
FDB4
FD00
FD01
FD02
FD13
FD14
FD40
FD54
FD60
FD74
FD80
FD94
Hex
MSB
Row 2 Column 1 Character Data
Row 2 Column 20 Character Data
Row 1 Column 1 Character Data
Row 1 Column 20 Character Data
Row 1 Attribute (ROW1_ATTR)
Row 1 Column 2 Through
Column 19 Character Data
Row 2 Attribute (ROW2_ATTR)
Row 2 Column 2 Through
Column 19 Character Data
Row 6 Video RAM Buffer
Row 4 Video RAM Buffer
Row 5 Video RAM Buffer
Row 3 Video RAM Buffer
(7 Bits Wide)
DS97TEL1902
LSB
Zilog