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M37220M3-XXXSP/FP
4.5 Functional description
The different CRT display function–related registers from those of M37221M6-XXXSP/FP are shown in the
following pages.
Border Selection Register
b7 b6 b5 b4 b3 b2 b1 b0
Fig. 4.5.13 Border selection register (addresses 00E5
Color Register n
b7 b6 b5 b4 b3 b2 b1 b0
Fig. 4.5.14 Color register n (addresses 00E6
4-24
Border selection register (MD) [Address 00E5
B
Name
0
Block 1 OUT output
border selection bit (MD10)
1
Nothing is assigned. This bit is a write disable bit.
When this bit is read out, the value is "0."
2
Block 1 OUT output
border selection bit (MD20)
3
Nothing is assigned. These bits are write disable bits.
to
When these bits are read out, the values are "0."
7
16
Color register n (COn) (n = 0 to 3) [Addresses 00E6
B
Name
0
Nothing is assigned. This bit is a write disable bit.
When this bit is read out, the value is "0."
1
B signal output
0 : No character is output
selection bit (COn1)
1 : Character is output
0 : No character is output
G signal output
2
1 : Character is output
selection bit (COn2)
3
R signal output
0 : No character is output
selection bit (COn3)
1 : Character is output
4
Nothing is assigned. This bit is a write disable bit.
When this bit is read out, the value is "0."
0 : Character is output
5
OUT signal output
1 : Blank is output
control bit (COn5)
6, 7
Nothing is assigned. These bits are write disable bits.
When these bits are read out, the values are "0."
to 00E9
16
16
7220 Group User's Manual
]
16
Functions
0 : Same output as character output
1 : Border output
0 : Same output as character output
1 : Border output
)
to 00E9
]
16
16
Functions
)
After reset
R W
Indeterminate
R W
0
R —
Indeterminate
R W
0
R —
After reset R W
0
R —
0
R W
0
R W
0
R W
0
R —
0
R W
0
R —
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