M69000 Asiliant Technologies, M69000 Datasheet - Page 358

• Manufacturer Part Number: M69000
• Manufacturer: Asiliant Technologies

Specifications of M69000

• Lead Free Status / Rohs Status: Supplier Unconfirmed

BitBLT Operation
E-23
This BitBLT operation does not use the values in the Pattern Address Register (BR05), the Source
Expansion Background Color Register (BR09), or the Source Expansion Foreground Color Register
(BR0A).
The Destination Width and Height Register (BR08) must be programmed with values that describe to the
BitBLT engine the 8x8 pixel size of the destination location. Bits 28-16 should be set to carry the value of
8h, indicating that the destination location covers 8 scan lines. Bits 12-0 should be set to carry the value of
8h, indicating that each scan line’s worth of destination data occupies 8 bytes. As mentioned in the previous
example, the act of writing a non-zero value for the height to the Destination Width and Height Register
(BR08) provides the BitBLT engine with the signal to begin performing this BitBLT operation. Therefore, it
is important that all other programming of the BitBLT engine registers be completed before this is done.
Figure E-18 shows the end result of performing this BitBLT operation. Only the pixels that form part of the
actual letter “f” have been drawn into the 8x8 destination location on the display, leaving the other pixels
within the destination with their original gray color.
Figure E-18: Results of Example Character Drawing BitBLT
&+,36
69000 Databook
Subject to Change Without Notice
Revision 1.3 8/31/98