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4.4
Software Considerations
Attribute Codes
The 8 bits of data stored in the attribute RAM are used to control the
display of each character in the display. Six functions are available for
each character and selected by the data in the attribute RAM. These func-
tions are shown in Table 4.3, along with the code that generates them.
In order to blink the character, the blink enable bit in the control register
must be set as described earlier in this chapter.
Table 4.3.
Attribute Codes
FUNCTION
ATrRIBUTE DATA BITS
CONTROL REGISTER
-::;-7
---:6::----;:5,....-----.4--3;:;------;2::-----.--0;:;--
DATA BIT
3
Not displayed
0
o
o
o
o
o
0
0
x
Intensity
background
Blink
x
x
x
x
x
x
x
x
x
x
x
x
x
x
o
Underline
x
x
x
x
x
o
0
x
Intensity
foreground
x
x
x
x
x
x
x
x
Reverse
video
x
x
o
o
0
x
x
=
value does not affect attribute
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