M69000 Asiliant Technologies, M69000 Datasheet - Page 247

• Manufacturer Part Number: M69000
• Manufacturer: Asiliant Technologies

Specifications of M69000

• Lead Free Status / Rohs Status: Supplier Unconfirmed

15-32
FR40
read/write at I/O address 3D1h with index at I/O address 3D0h set to 40h
This register is used in FP mode (FR01 Bit 1 set to 1)
7-6
5
4-3
&+,36
7
Reserved (R/W)
FP Enable Graphics Horizontal Compensation (EGHC)
0: Disable graphics mode horizontal compensation.
1: Enable graphics mode horizontal compensation which consists of horizontal stretching and
FR41 is used to specify stretching for different horizontal resolutions.
This bit is effective only when bit 0 is 1.
Text Horizontal Compensation Priority (THCP)
Reserved
69000 Databook
(00)
Horizontal Compensation Register
These bits are effective only when bit 0 is 1 and bit 2 is 1. These bits determine the text
mode compression/stretching method to be applied if horizontal panel size is wide enough.
If after applying the specified text compression/stretching, the horizontal panel size is still
wider than the stretched image then further stretching will be applied using the same
algorithm used for horizontal graphics compensation.
6
Bits
4 3
0 0
0 1
1 0
1 1
Allow 9-dot compression to 8-dot if needed. If horizontal panel
size is wide enough, 8-dot text remains 8-dot text and 9-dot
text remains 9-dot text. If horizontal panel size is not wide
enough, then 8-dot text remains 8-dot text and 9-dot text is
forced to 8-dot text. This is the default after reset.
No compression or expansion. 8-dot text remains 8-dot text
and 9-dot text remains as 9-dot text regardless of horizontal
panel size.
Allow 8-dot expansion to 9-dot, or 9-dot compression to 8-dot,
depending on horizontal panel size. If horizontal panel size is
wide enough, 8-dot text is forced to 9-dot text and 9-dot text
remains 9-dot text. If horizontal panel size is not wide enough
then 8-dot text remains 8-dot text and 9-dot text is forced to 8-
dot text.
Allow 8-dot and 9-dot expansion to 10-dot, or 8-dot expansion
to 9-dot, or 9-dot compression to 8-dot, depending on
horizontal panel size. If horizontal panel size is wide enough,
8-dot text is forced to 10-dot text and 9-dot text is forced to 10-
dot text. Otherwise, if horizontal panel size is wide enough,
8-dot text is forced to 9-dot text and 9-dot text remains 9-dot
text. If horizontal panel size is not wide enough, then 8-dot
text remains 8-dot text and 9-dot text is forced to 8-dot text.
EGHC
(0)
5
Text Horizontal Compensation Priority (THCP)
Subject to Change Without Notice
Flat Panel Registers
4
THCP
(0:0)
3
ETHC
(0)
2
EHC
(0)
Revision 1.3 8/31/98
1
EHCP
(0)
0