Maxim-integrated MAX31782 Manual do Utilizador descarregar pdf (Página 188)

Maxim Integrated 20-5

MAX31782 User’s Guide

Revision 0; 8/11

{L/S}CALL src {Long/Short} Call to Subroutine

Description: Performs a call to the subroutine destination specified by src. The CALL instruction uses an 8-bit

immediate src to perform a relative short call (IP +127/-128 words). The CALL instruction uses a

16-bit immediate src to perform an absolute long CALL to the specified 16-bit address. The PFX[0]

Using the optional ‘L’ prefix (i.e., LCALL) results in an absolute long call and use of the PFX[0]

flagged by the assembler if the destination is out of range. Specifying an internal register src always

produces an absolute CALL to a 16-bit address, thus the ‘L’ and ‘S’ prefixes should not be used.

Status Flags: None

Operation: @++SP ← IP + 1 PUSH

IP ← src Absolute CALL

IP ← IP + src Relative CALL

Encoding: 15 0

f011 1101

ssss ssss

Example(s): CALL label1 ; relative call to label1 (must be within IP +127/ -

; 128 address range)

CALL label1 ; absolute call to label1 = 0120h

; MOVE PFX[0], #01h

; CALL #20h.

CALL DP[0] ; DP[0] holds 16-bit address of subroutine

LCALL label1 ; label=0120h and is relative to this instruction

; absolute call is forced by use of ‘L’ prefix

; MOVE PFX[0], #01h

; CALL #20h

SCALL label1 ; relative offset for label1 calculated and used

; if label1 is not relative, assembler will generate an error

SCALL #10h ; relative offset of #10h is used directly by the CALL

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Maxim-integrated MAX31782 Manual do Utilizador Página 188