M37221M4H_15 Datasheet, PDF (72/114 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER

M37221M4H/M6H/M8H/MAH–XXXSP/FP M37221EASP/FP
8.11.6 Border
An border of 1 clock (1 dot) equivalent size can be added to a char-
acter to be displayed in both horizontal and vertical directions. The
border is output from the OUT1 pin. In this case, set bit 5 of a color
register to “0” (character is output).
Border can be specified in units of block by using the border selec-
tion register (address 00E516). Figure 8.11.14 shows the border se-
lection register. Table 8.11.6 shows the relationship between the val-
ues set in the border selection register and the character border func-
tion.
Fig. 8.11.15 Example of Border
Border Selection Register
b7 b6 b5 b4 b3 b2 b1 b0
Border selection register (MD) [Address 00E5 16]
B
Name
Functions
After reset R W
0 Block 1 OUT1 output
0 : Same output as R, G, B is output ^{Indeterminate} R W
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.”
0
R—
2 Block 2 OUT1 output
0 : Same output as R, G, B is output ^{Indeterminate} R W
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.”
0
R—
Fig. 8.11.14 Border Selection Register
Table 8.11.6 Relationship between Set Value in Border Selection Register and Character Border Function
Border selection register
MDi0
0
Functions
Ordinary
Example of output
R, G, B output
OUT1 output
1
Note: i indicates 1or 2
Border including character
R, G, B output
OUT1 output
Rev.1.00 Oct 01, 2002 page 70 of 110
REJ03B0134-0100Z