EF9345 Datasheet, PDF (31/38 Pages) STMicroelectronics – HMOS2 SINGLE CHIP SEMI-GRAPHIC DISPLAY PROCESSOR

EF9345
Displaying the Attributes - DOR Register
Short code and mosaïc characters are not flashing,
not underlined and ”positive”.
The attributesare processedin the following order :
- Underline or underlined cursor : foreground is
forced on the last slice (NT = 9).
- Flash : background is periodically (0.5Hz - 50%)
forced on all the window. The phase depends on
the negative attribute.
- Color select : a ”positive” character is displayed
with a background color same as the margin
color. The foreground color is selected in DOR
register by the D attribute.
- Negative : when the character is negative, back-
ground and foreground colors are exchanged. In
complemented CURSOR position, these colors
are complemented.
- Insert : the D attribute selects one insert value in
DOR register. This attribute is then processed up
to the current insertion mode (see screen format
and attribute insert section.
Figure 31 : KRC Command : Sequential Access to Short Codes
KRC Command
R1 C
R2 -
R3 -
D district
number
B (even)
R4 -
R5 - ^Y
R6 D, Y
R7 B, X
B + 1 (odd)
X
Figure 32 : Transcoding an Horizontal Screen Location into a R7 Pointer
76543210
b1 X5 X4 X3 X2 X1 X0 b0
Rotate right
76543210
b0 b1 X5 X4 X3 X2 X1 X0
CHARACTER POSITION (0 to 79)
Figure 33
DOR
76543210
I₁ B₁ G₁ R₁ I₀ B₀ G₀ R₀
C₁
D=1
C₀
D=0
MAT
XX
B_M G _M R _M
C_M
The pixel shift frequency is f_CLK (12MHz)
Block parity
X = (0 to 39)
D
N
Background Foreground
Color
Color
i
0
0
C_M
0
1
C₀
1
0
C_M
1
1
C₁
C₀
i₀
C_M
i₀
C₁
i₁
C_M
i₁
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