7220 Datasheet, PDF (262/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPENDIX
6.7 Control registers
CRT Port Control Register
b7 b6 b5 b4 b3 b2 b1 b0
CRT port control register (CRTP) [Address 00EC16]
B
Name
0 HSYNC input polarity
switch bit (HSYC)
1 VSYNC input polarity
switch bit (VSYC)
2 R, G, B output polarity
switch bit (R/G/B)
3 OUT2 output polarity
switch bit (OUT2)
4 OUT1 output polarity
switch bit (OUT1)
5 R signal output switch bit
(OP5)
6 G signal output switch bit
(OP6)
7 B signal output switch bit
(OP7)
Functions
0 : Positive polarity
1 : Negative polarity
0 : Positive polarity
1 : Negative polarity
0 : Positive polarity
1 : Negative polarity
0 : Positive polarity
1 : Negative polarity
0 : Positive polarity
1 : Negative polarity
0 : R signal output
1 : MUTE signal output
0 : G signal output
1 : MUTE signal output
0 : B signal output
1 : MUTE signal output
Note : M37220M3-XXXSP/FP
3 Nothing is assigned. This bit is a write disable bit.
When this bit is read out, the value is “0.”
4 OUT output polarity
switch bit (OUT)
0 : Positive polarity
1 : Negative polarity
Fig. 6.7.20 CRT port control register
After reset R W
0 RW
0 RW
0 RW
0 RW
(See note)
0 RW
0 RW
0 RW
0 RW
0 R—
0 RW
Address 00EC16
7220 Group User’s Manual
6-43