7220 Datasheet, PDF (162/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

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
Border selection register (MD) [Address 00E5 16]
B
Name
Functions
0 Block 1 OUT output
0 : Same output as character output
border selection bit (MD10) 1 : Border output
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
0 : Same output as character output
border selection bit (MD20) 1 : Border output
3
to
7
Nothing is assigned. These bits are write disable bits.
When these bits are read out, the values are “0.”
After reset R W
Indeterminate R W
0
R—
Indeterminate R W
0
R—
Fig. 4.5.13 Border selection register (addresses 00E516)
Color Register n
b7 b6 b5 b4 b3 b2 b1 b0
Color register n (COn) (n = 0 to 3) [Addresses 00E6 16 to 00E916]
B
Name
Functions
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
selection bit (COn1)
0 : No character is output
1 : Character is output
2 G signal output
selection bit (COn2)
0 : No character is output
1 : Character is output
3 R signal output
selection bit (COn3)
0 : No character is output
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.”
5 OUT signal output
control bit (COn5)
0 : Character is output
1 : Blank is output
6, 7 Nothing is assigned. These bits are write disable bits.
When these bits are read out, the values are “0.”
Fig. 4.5.14 Color register n (addresses 00E616 to 00E916)
After reset R W
0 R—
0 RW
0 RW
0 RW
0 R—
0 RW
0 R—
4-24
7220 Group User’s Manual