7220 Datasheet, PDF (163/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

M37220M3-XXXSP/FP
4.5 Functional description
CRT Control Register
b7 b6 b5 b4 b3 b2 b1 b0
CRT control register (CC) [Address 00EA16]
B
Name
Functions
After reset R W
0 All-blocks display control
bit (Note) (CC0)
0 : All-blocks display off
1 : All-blocks display on
0 RW
1 Block 1 display control bit 0 : Block 1 display off
(CC1)
1 : Block 1 display on
0 RW
2 Block 2 display control bit 0 : Block 2 display off
(CC2)
1 : Block 2 display on
3 _{Nothing is assigned. These bits are write disable bits.}
to _{When these bits are read out, the values are “0.”}
7
0 RW
0 R—
Note: Display is controlled by logical product (AND) between the all-blocks display
control bit and each block control bit.
Fig. 4.5.15 CRT control register (address 00EA16)
CRT Port Control Register
b7 b6 b5 b4 b3 b2 b1 b0
CRT port control register (CRTP) [Address 00EC 16]
B
Name
Functions
0 HSYNC input polarity
switch bit (HSYC)
0 : Positive polarity
1 : Negative polarity
1 VSYNC input polarity
switch bit (VSYC)
0 : Positive polarity
1 : Negative polarity
2 R, G, B output polarity
switch bit (R/G/B)
0 : Positive polarity
1 : Negative polarity
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
5 R signal output switch bit 0 : R signal output
(OP5)
1 : MUTE signal output
6 G signal output switch bit 0 : G signal output
(OP6)
1 : MUTE signal output
7 B signal output switch bit 0 : B signal output
(OP7)
1 : MUTE signal output
After reset R W
0 RW
0 RW
0 RW
0 R—
0 RW
0 RW
0 RW
0 RW
Fig. 4.5.16 CRT port control register (address 00EC16)
7220 Group User’s Manual
4-25