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RRF

June 23, 20191 min read

Rotate Right f through Carry

The contents of register ‘f’ are rotated one bit to the right through the Carry flag. If ‘d’ is ‘0’, the result is placed in the W register. If ‘d’ is ‘1’, the result is placed back in register ‘f’.

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Syntax:

[ label ] RRF f,d

Operation:

Operands:

  • f is from 0 to 127
  • d is either 0 or 1

Status Affected: C

Example:

RRF REG,0

Before instruction:

REG = 0x02
W = 0x04

After instruction:

REG = 0x02
W = 0x01

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Example:

RRF REG,1

Before instruction:

REG = 0x01
W = 0x04

After instruction:

REG = 0x00
W = 0x04

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.