Appeal No. 1996-1097
Application 08/058,110
from the COIL1_H register associated with the remaining
ignition coil bank 14 [BANK 1] and having a hexadecimal
address of $0000." (Specification, page 10, line 32,
through page 11, line 3.)
This constant address offset between sets of
corresponding registers in different banks permits a single
program routine stored in the ROM 36 to independently
control both ignition coil banks using indexed addressing
mode instructions. This is illustrated by comparing the
prior art control system of figure 6 with the invention in
figure 7. In figure 6, the instructions for ignition BANK 1
are executed 100 and then the instructions for ignition
BANK 2 are executed 102. "[S]uch a program routine requires
the instructions for controlling an ignition coil bank 14 to
be duplicated for each ignition coil bank 14, thereby using
more space in the ROM segment 36 and increasing the
likelihood of error when the instructions are encoded."
(Specification, page 20, lines 7-12.)
In figure 7, the same instructions are executed 112 for
both ignition coil banks using an indexed addressing mode
together with a constant address offset to select between
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Last modified: November 3, 2007