Display Control Registers; Display Window Registers (Dswr (Hds/Hde/Vds/Vde)) - Hitachi HD64411 Q2 User Manual

5 . 5

Display Control Registers

The display control registers comprise twelve 16-bit registers for setting the display timing,
mapped onto addresses (A10–A1) H'013 to H'01E.
5 . 5 . 1

Display Window Registers (DSWR (HDS/HDE/VDS/VDE))

Bit: 15 14
DSWR (HDS) — —
Initial value: — —
—
Read/Write: —
Bit: 15 14
DSWR (HDE) — —
Initial value: — —
— —
Read/Write:
Bit: 15 14
DSWR (VDS) — —
Initial value: — —
Read/Write: — —
Bit: 15 14
DSWR (VDE) — —
Initial value: — —
— —
Read/Write:
Note: * Value is retained.
The display window registers (DSWR (HDS/HDE/VDS/VDE)) are 16-bit readable/writable
registers that specify the horizontal and vertical output timing for the display screen.
1. Horizontal Display Start Position (Bits HDS): Field that specifies the horizontal display start
position in dot-clock units.
2. Horizontal Display End Position (Bits HDE): Field that specifies the horizontal display end
position in dot-clock units.
3. Vertical Display Start Position (Bits VDS): Field that specifies the vertical display start
position in dot-clock units.
4. Vertical Display End Position (Bits VDE): Field that specifies the vertical display end position
in dot-clock units.
150
13 12 11 10 9
— — — — —
— — — — —
— — — — —
13 12 11 10 9
— — — — HDE
— — — — *
— — — —
R/W
13 12 11 10 9
— — — — —
— — — — —
— — — — —
13 12 11 10 9
— — — — VDE
— — — — *
—
— — — R/W
8 7 6 5 4
HDS HDS HDS HDS HDS
* * * * *
R/W R/W R/W R/W R/W
8 7 6 5 4
HDE HDE HDE HDE HDE
* * * * *
R/W
R/W R/W R/W R/W
8 7 6 5 4
VDS VDS VDS
VDS VDS
* * * * *
R/W R/W R/W R/W R/W
8 7 6 5 4
VDE VDE VDE VDE VDE
* * * * *
R/W R/W R/W R/W R/W
3 2 1 0
HDS HDS
HDS HDS
* * * *
R/W R/W R/W R/W
3 2 1 0
HDE HDE HDE HDE
* * * *
R/W R/W R/W R/W
3 2 1 0
VDS VDS VDS VDS
* * * *
R/W R/W R/W R/W
3 2 1 0
VDE VDE VDE VDE
* * * *
R/W R/W R/W
R/W