Propeller Manual

PHSA, PHSB – Assembly Language Reference
PHSA, PHSB
Register: Counter A and Counter B phase registers.
DAT
〈Label〉 〈Condition〉 Instruction PHSA, SrcOperand 〈Effects〉
DAT
〈Label〉 〈Condition〉 Instruction DestOperand, PHSA 〈Effects〉
DAT
〈Label〉 〈Condition〉 Instruction PHSB, SrcOperand 〈Effects〉
DAT
〈Label〉 〈Condition〉 Instruction DestOperand, PHSB 〈Effects〉
Result: Optionally, the counter phase register is updated.
•
Label is an optional statement label. See Common Syntax Elements, page 250.
•
Condition is an optional execution condition. See Common Syntax Elements, page 250.
•
Instruction is the desired assembly instruction. PHSA and PHSB are read/write pseudo-
registers that act differently in the SrcOperand
than they do in the DestOperand.
•
SrcOperand is a constant expression used by Instruction to operate on, and optionally
write to, the
PHSA or PHSB register in DestOperand.
•
DestOperand is a constant expression indicating the register that is operated on, and
optionally written to, using the value of
PHSA or PHSB in SrcOperand.
Explanation
PHSA and PHSB are two of six registers (CTRA, CTRB, FRQA, FRQB, PHSA, and PHSB) that affect the
behavior of a cog’s Counter Modules. Each cog has two identical counter modules (A and B)
that can perform many repetitive tasks. The
PHSA and PHSB registers contain the
accumulations of the
FRQA and FRQB registers’ value, respectively, according to the
corresponding counter’s mode and input stimulus. See the Spin language
CTRA, CTRB section
on page 95 for more information.
PHSA and PHSB are read/write pseudo-registers. In the SrcOperand they read the counter’s
accumulator value. In the DestOperand they read the shadow register whose address
PHSA or
PHSB occupies, but modifications affect both the shadow and accumulator registers.
The following code moves the value of
PHSA into Result. See Registers, page 338, and the
Spin language
PHSA, PHSB section, page 180, for more information.
mov Result, phsa 'Get current phase value
Page 332 · Propeller Manual v1.1