Timer Count Register (Tcount; Data Address Generator Registers; Index Registers (Ix; Modify Registers (Mx - Analog Devices ADSP-21261 SHARC Hardware Reference Manual

Timer Count Register (TCOUNT)

The register is a non memory-mapped, universal register (
TCOUNT
only). The Timer Count register contains the timer period, indicating the
number of cycles between timer interrupts. For more information on how
to use the
TCOUNT

Data Address Generator Registers

The DSP's Data Address Generator (DAG) registers hold data addresses,
modify values, and circular buffer configurations. Using these registers,
the DAGs can automatically increment addressing for ranges of data loca-
tions (a buffer).
page 4-1.
Table A-12. DAG Registers
Register
"Index Registers (Ix)" on page A-37
"Modify Registers (Mx)" on page A-37
"Length and Base Registers (Lx, Bx)" on page A-38

Index Registers (Ix)

The registers are non-memory-mapped, universal registers (
Ix
The DAGs store addresses in Index registers (
for DAG2). An index register holds an address and acts as a pointer to a
memory location.

Modify Registers (Mx)

The register are non-memory-mapped, universal registers (
Mx
The DAGs update stored addresses using Modify registers (
DAG1 and –
M8
ADSP-2126x SHARC Processor Hardware Reference
register, see "Timer and Sequencing" on page
For more information, see "Data Address Generators" on
for DAG2). A Modify register provides the increment
M15
Registers Reference
Initialization After Reset
Undefined
Undefined
Undefined
Ureg
– for DAG1 and
I0 I7
Ureg
–
M0 M7
Ureg
3-46.
only).
–
I8 I15
only).
for
A-37