
Core Registers
A-34
ADSP-2126x SHARC Processor Hardware Reference
Program Counter Stack Register (PCSTK)
This is a non-memory-mapped, universal register (
Ureg
only). The Pro-
gram Counter Stack register contains the address of the top of the
PC
stack. This register is a readable and writable register.
Program Counter Stack Pointer Register (PCSTKP)
The
PCSTKP
register is a non-memory-mapped, universal register (
Ureg
only). The Program Counter Stack Pointer register contains the value of
PCSTKP
. This value is given as follows: 0 when the
PC
stack is empty, 1...30
when the stack contains data, and 31 when the stack overflows. This regis-
ter is readable and writable. A write to
PCSTKP
takes effect after a one-cycle
delay. If the
PC
stack is overflowed, a write to
PCSTKP
has no effect.
Figure A-10. PM and DM Bus Addresses Versus Sequencing Addresses
PM and DM Address Buses and DAGs Can Handle 32-Bit Addresses
Program Sequencer Handles
S Field
Bits 20-18, System (Internal) Memory
Bits 31-21, All zeros
31
23
21
20
18 17
0
System Values in this field have
the following meaning:
000- Address of an IOP register
001- Address in Long Word space
01x- Address in Normal Word space
1xx- Address in Short Word space
24-Bit Addresses
17-16 = 00; IOP peripheral
17-16 = 11; IOP core
Summary of Contents for ADSP-21261 SHARC
Page 30: ...Contents xxx ADSP 2126x SHARC Processor Hardware Reference ...
Page 40: ...Register Diagram Conventions xl ADSP 2126x SHARC Processor Hardware Reference ...
Page 58: ...Differences From Previous SHARCs 1 18 ADSP 2126x SHARC Processor Hardware Reference ...
Page 112: ...Secondary Processing Element PEy 2 54 ADSP 2126x SHARC Processor Hardware Reference ...
Page 178: ...Summary 3 66 ADSP 2126x SHARC Processor Hardware Reference ...
Page 204: ...DAG Instruction Summary 4 26 ADSP 2126x SHARC Processor Hardware Reference ...
Page 322: ...Setting Up DMA 7 32 ADSP 2126x SHARC Processor Hardware Reference ...
Page 436: ...SPORT Programming Examples 9 86 ADSP 2126x SHARC Processor Hardware Reference ...
Page 521: ...ADSP 2126x SHARC Processor Hardware Reference 11 31 Input Data Port rts IDP_ISR end ...
Page 522: ...Input Data Port Programming Example 11 32 ADSP 2126x SHARC Processor Hardware Reference ...
Page 590: ...Timer Programming Examples 14 20 ADSP 2126x SHARC Processor Hardware Reference ...
Page 796: ...I O Processor Registers A 174 ADSP 2126x SHARC Processor Hardware Reference ...
Page 800: ...B 4 ADSP 2126x SHARC Processor Core Manual ...
Page 846: ...Index I 36 ADSP 2126x SHARC Processor Hardware Reference ...