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參數(shù)資料
| 型號： | MC141585 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 畫面疊加 |
| 英文描述： | Rad-Tolerant Class V, Floating Point Digital Signal Processor 429-CFCBGA -55 to 115 |
| 中文描述： | ON-SCREEN DISPLAY IC, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 8/27頁 |
| 文件大小： | 678K |
| 代理商： | MC141585 |
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MC141585
8
MOTOROLA
- C means column byte.
- I means data byte.
- In format (c), one dummy data byte(col 31) has
to be inserted after the row attribute data byte
(col 30) at end of each row, before the first
character attribute data byte of the next row.
To differentiate the row address for attribute/control regis-
ters from display area when transferring data, the most sig-
nificant three bits are set to ‘101’ to represent the row
address of the attribute/control registers, while ‘00X’ for col-
umn address used in format (a) or (b) and ‘01X’ for column
address used in format (c). There is some limitation on using
mix-formats during a single transmission. It is permissible to
change the format from (a) to (b), or from (a) to (c), or from
(b) to (a), but not from (c) back to (a) or (b).
Figure 7. Data Packet for Attribute/Control Data
Figure 8. Address Bit Patterns for Attribute/Control Data
MEMORY MANAGEMENT
All the internal programmable area can be divided into
two parts including (1) Display Registers (2) Attribute/Control
Registers. Please refer to the following two figures for the
corresponding memory map.
Figure 9. Memory Map of Display Registers
Internal display RAM are addressed with row and column
(coln) number in sequence. As the display area is 15 rows
by 30 columns, the related display registers are also 15 by
30. The space between row 0 and coln 0 to row 14 and coln
29 are called Display registers, with each contains a charac-
ter/symbol address corresponding to display location on
monitor screen. And each register is 8-bit wide to identify the
selected character/symbol out of 256 logical selected ROM
fonts.
Figure 10. Memory Map of Attribute/Control Registers
Besides the font selection, there is 3-bit attribute associ-
ated with each symbol to identify its color and 3-bit to define
its background. Because of 3-bit attribute, each character
can select any color out of 8 independently on the same row.
as well as background. Every data row associate with one
attribute register, which locate at coln 30 of their respective
row addr
col addr
info
ADDRESS
ROW
COLUMN
COLUMN
X: don’t care
D: valid data
FORMAT
BIT
0
1
2
3
4
5
6
7
D
D
D
D
D
1
0
1
D
D
D
D
D
D
D
D
D
D
X
X
0
1
0
0
a, b
a, b, c
c
CHARACTER ATTRIBUTE REGISTERS
29 30
0
0
14
R
R
WINDOW 1 ~ WINDOW 4
FRAME CRTL REG
15
0
1112
19
27 28
WINDOW/FRAME CONTROL REGISTERS
31
18
RESERVED
16
0
SPECIAL CONTROL REGISTERS
CONFIG
1
HATCH
2
WIND. SHDW COLOR
PAGE
3
4
HOR. DELAY
5
DISPLAY REGISTERS
COLUMN
29
0
0
14
R
27 28
CHARACTER ATTRIBUTE REGISTERS
COLUMN
29 30
0
0
14
R
R
WINDOW 1 ~ WINDOW 4
FRAME CRTL REG
15
0
1112
19
27 28
WINDOW/FRAME CONTROL REGISTERS
31
18
RESERVED
16
0
SPECIAL CONTROL REGISTERS
CONFIG
1
HATCH
2
WIND. SHDW COLOR
PAGE
3
4
HOR. DELAY
5
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