M69000 Asiliant Technologies, M69000 Datasheet - Page 145

• Manufacturer Part Number: M69000
• Manufacturer: Asiliant Technologies

Specifications of M69000

• Lead Free Status / Rohs Status: Supplier Unconfirmed

11-2
GRX
read/write at I/O address 3CEh
This register is cleared to 00h by reset.
7-4
3-0
GR00
read/write at I/O address 3CFh with index at address 3CEh set to 00h
7-4
3-0
&+,36
7
7
Reserved
Graphics Controller Register Index
These four bits are used to select any one of the graphics controller registers, GR00 through GR08,
to be accessed via the data port at I/O location 3CF.
Reserved
Set/Reset Plane 3 through Set/Reset Plane 0
When the Write Mode bits (bits 0 and 1) of the Graphics Mode Register (GR05) are set to select
Write Mode 0, all 8 bits of each byte of each memory plane are set to either 1 or 0 as specified in
the corresponding bit in this register if the corresponding bit in the Enable Set/Reset Register
(GR01) is set to 1.
When the Write Mode bits (bits 0 and 1) of the Graphics Mode Register (GR05) are set to select
Write Mode 3, all CPU data written to the frame buffer is rotated, then logically ANDed with the
contents of the Bit Mask Register (GR08) and then treated as the addressed data’s bit mask, while
value of these four bits of this register are treated as the color value.
69000 Databook
Graphics Controller Index Register
Set/Reset Register
6
6
Reserved
Reserved
5
5
Subject to Change Without Notice
Graphics Controller Registers
4
4
Set/Reset
Plane 3
3
3
Graphics Controller Register Index
Set/Reset
Plane 2
2
2
Set/Reset
Plane 1
Revision 1.3 8/31/98
1
1
Set/Reset
Plane 0
0
0