Appeal No. 1997-2983 Page 2
Application No. 08/482,792
SDBUS is used to transfer context data saved from or restored
to a register set (RF), program counter (PC), and processor
status word (PSW). When a currently executing program is
interrupted by a program to be executed, context data
representing the instant execution status of the currently
executing program (e.g., the contents of PC and PSW) are
transferred from a central processing unit (CPU) to an
external memory via the SDBUS and BABUS. Context data for
program to be executed are then transferred via the SDBUS and
BABUS to replace the previous context data.
Claims 6 and 13, which are representative for our
purposes, follow:
6. A single chip microcomputer comprising:
(a) a central processing unit (CPU) for
processing programs, said CPU comprising a Processor
Status Word Register, a Program Counter Register,
and a General Purpose Register Set;
(b) an on-chip RAM;
(c) an on-chip ROM;
(d) a first bus for connecting said CPU,
RAM and ROM with one another and passing data
between them;
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