Renesas PC4400 Manuel d'utilisateur télécharger pdf (Page 26)

( 26 / 38 )

(2) Skip instructions (e.g. SNZP, INY, DEY, SZB, SEAM, SZC and RTS)

In cases when a skip instruction skips the next instruction, a break point set in the skipped

instruction does not cause execution to halt. (See Program examples 5.3 and 5.4)

Program example 5.3

LXY 0,0

SZD

POINT: B jmp_adr ; Skip when D(0) = 0

POINT_A: TAM 0

•

If a break point is set at POINT,

D(0) = 0: Execution is halted immediately before the instruction at POINT.

D(0) = 1: Execution is NOT halted because the instruction at POINT is skipped.

To halt execution immediately after a skip instruction, set break points at POINT and POINT_A.

Program example 5.4

INY

POINT: TABP ; Skip when (Y) = 0

LA 0

•

If a break with pass count is set at address POINT, the count is taken and execution is halted

only when the instruction at address POINT is executed.

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 37 38

Pas de commentaire

Renesas PC4400 Manuel d'utilisateur Page 26