FRQA, FRQB

Owned by Brett Weir
Last updated: May 06, 2018
1 min read

Register: Counter A and Counter B frequency registers. 

DAT< Label > < Condition > Instruction FRQA, SrcOperand < Effects >

DAT
< Label > < Condition > Instruction DestOperand, FRQA < Effects >

DAT
< Label > < Condition Instruction > FRQB, SrcOperand < Effects >

DAT
< Label > < Condition Instruction > DestOperand, FRQB < Effects >

Result: Optionally, the counter frequency register is updated.

  • Label is an optional statement label. See Common Syntax Elements.
  • Condition is an optional execution condition. See Common Syntax Elements.
  • Instruction is the desired assembly instruction. FRQA or FRQB may be used in either the assembly instruction's DestOperand or SrcOperand fields.
  • SrcOperand is a constant expression used by Instruction to operate on, and optionally write to, the FRQA or FRQB register in DestOperand.
  • DestOperand is a constant expression indicating the register that is operated on, and optionally written to, using the value of FRQA or FRQB in SrcOperand.

Explanation

FRQA and FRQB 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 FRQA and FRQB registers contain the value that is accumulated into the PHSA and PHSB registers, respectively, according to the corresponding counter's mode and input stimulus. See the Spin language CTRA, CTRB for more information.

FRQA and FRQB are read/write registers and can be used in either the DestOperand or SrcOperand fields of an assembly instruction. The following code sets FRQA to $F. See Registers, and the Spin language FRQA, FRQB, for more information.

mov    frqa,    #$F

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