Texas Instruments TMS320C28x Reference Manual page 660

16-bit operation: An operation that reads or writes 16 bits.
32-bit operation: An operation that reads or writes 32 bits.
A
absolute branch: A branch to an address that is permanently assigned to
ACC: See accumulator (ACC).
access: A term used in this document to mean read from or write to. For ex-
accumulator (ACC): A 32-bit register involved in a majority of the arithmetic
address-generation logic: Hardware in the CPU that generates the ad-
address reach: The range of addresses beginning with 00 0000
address register arithmetic unit (ARAU): Hardware in the CPU that gen-
addressing mode: The method by which an instruction interprets its oper-
AH: High word of the accumulator. The name given to bits 31 through 16 of
a memory location. See also offset branch.
ample, to access a register is to read from or write to that register.
and logical calculations done by the C28x. Some instructions that affect
ACC use all 32 bits of the register. Others use one of the following por-
tions of ACC: AH (bits 31 through 16), AL (bits 15 through 0), AH.MSB
(bits 31 through 24), AH.LSB (bits 23 through 16), AL.MSB (bits 15
through 8), and AL.LSB (bits 7 through 0).
dresses used to fetch instructions or data from memory.
be used by a particular addressing mode.
erates addresses for values that must be fetched from data memory. The
ARAU is also the hardware used to increment or decrement the stack
pointer (SP) and the auxiliary registers (AR0, AR1, AR2, AR3, AR4, AR5,
XAR6, and XAR7).
ands to acquire the data and/or addresses it needs.
the accumulator.
Appendix G
Appendix A
Glossary
that can
16
G-1