Samsung KS57C2308 Manual page 150

SAM47 INSTRUCTION SET
REF
— Reference Instruction
REF (Continued)
Examples: 1. Instructions can be executed efficiently using REF, as shown in the following example:
AAA
BBB
CCC
DDD
2. The following example shows how the REF instruction is executed in relation to LD
instructions that have a "redundancy effect":
AAA
5-76
ORG 0020H
LD HL,#00H
LD EA,#FFH
TCALL SUB1
TJP SUB2
•
•
•
ORG 0080H
REF AAA
REF BBB
REF CCC
REF DDD
ORG 0020H
LD EA,#40H
•
•
•
ORG 0100H
LD EA,#30H
REF AAA
•
•
•
REF AAA
LD EA,#50H
SRB 2
; LD HL,#00H
; LD EA,#FFH
; CALL SUB1
; JP SUB2
; Not skipped
; Skipped
KS57C2308/P2308/C2316/P2316