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BTFSS

June 23, 20191 min read

Bit Test F, Skip if Set

If bit ‘b’ in register ‘f’ is ‘0’, the next instruction is executed. If bit ‘b’ is ‘1’, then the next instruction is discarded and a NOP is executed instead, making this a 2 TCY (instruction cycle) instruction.

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Syntax:

[ label ] BTFSS f,b

Operation:

skip if (f<b>) = 1

Operands:

  • 0 ≤ f ≤ 127
  • 0 ≤ b ≤ 7

Status Affected: None

Example:

BTFSS REG,0
GOTO SUB1
GOTO SUB2

If bit 0 of REG is set, the program jumps to GOTO SUB2. Otherwise, the line GOTO SUB1 is read.

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Roland Pelayo started TMM in 2015. He is a firmware engineer who has over ten years of experience in developing electronic and microcontroller-based systems. Roland's designs include medical devices, security and automation, robots, emergency alert systems, and educational training modules.   Have something that you like Roland to write about here? or do you need consultation for microcontroller firmware projects? just contact him via the contact page.