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RETLW

June 23, 20191 min read

Return Literal to W

W is loaded with the eight-bit literal 'k'. The program counter (PC) is loaded from the top of the stack (TOS). The high address latch (PCLATH) remains unchanged.

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Syntax:

[ label ] RETLW k

Operation:

(k) → (W),

(TOS) → (PC)

 

Operands:

  • k is from 0 to 255

Status Affected: None

Example:

SUB1 ADDWF PCL
     RETLW 0x07
     RETLW 0x08

If W is 1 before a call to SUB1, the value 7 is returned. If W is 2 before a call to SUB1, the value 8 is returned.

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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.