HUBOP

Owned by Brett Weir
Last updated: Oct 31, 2014 by DK Nguyen
1 min read

Instruction: Perform a hub operation.

HUBOP Destination, < # > Operation

Result: Varies depending on the operation performed.

  • Destination (d-field) is the register containing a value to use in the Operation.
  • Operation (s-field) is a register or a 3-bit literal that indicates the hub operation to perform.

Opcode Table:

–INSTR–  ZCRI  –CON–    –DEST–         –SRC–

Z Result

C Result

Result

Clocks

  000011    000i    1111    ddddddddd    sssssssss

Result = 0

—

Not Written

8..23

Concise Truth Table:

(Not specified because it varies with each hub operation. See CLKSET; COGID; COGINIT; COGSTOP; LOCKNEW; LOCKRET; LOCKSET, and LOCKCLR.)

Explanation

HUBOP is the template for every hub operation instruction in the Propeller chip: CLKSET, COGID, COGINIT, COGSTOP, LOCKNEW, LOCKRET, LOCKSET, and LOCKCLR. The instructions that perform hub operations set the Operation field (s-field of the opcode) to the 3-bit immediate value that represents the desired operation (see the opcode of each hub instruction's syntax description for more information). The HUBOP instruction itself should rarely be used, but may be handy for special situations.

HUBOP is a hub instruction. Hub instructions require 8 to 23 clock cycles to execute depending on the relation between the cog's hub access window and the instruction's moment of execution. See Hub for more information.

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