S3F80JB

INSTRUCTION SET

 

 

LDCPI/LDEPI — Load Memory with Pre-Increment

LDCPI/

LDEPI dst,src

Operation: rr rr + 1

dst src

These instructions are used for block transfers of data from program or data memory from the register file. The address of the memory location is specified by a working register pair and is first incremented. The contents of the source location are loaded into the destination location. The contents of the source are unaffected.

LDCPI refers to program memory and LDEPI refers to external data memory. The assembler makes 'Irr' an even number for program memory and an odd number for data memory.

Flags: No flags are affected.

Format:

opc

src dst

Bytes

Cycles

Opcode

Addr Mode

 

 

(Hex)

dst

src

2

14

F3

Irr

r

Examples: Given: R0 = 7FH, R6 = 21H, and R7 = 0FFH:

LDCPI

@RR6,R0

;

(RR6 RR6 + 1)

 

 

; 7FH (contents of R0) is loaded into program memory

 

 

; location 2200H (21FFH + 1H)

 

 

;

R0 = 7FH, R6 = 22H, R7 = 00H

LDEPI

@RR6,R0

;

(RR6 RR6 + 1)

 

 

; 7FH (contents of R0) is loaded into external data memory

 

 

; location 2200H (21FFH + 1H)

 

 

;

R0 = 7FH, R6 = 22H, R7 = 00H

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Samsung S3F80JB manual LDCPI/LDEPI Load Memory with Pre-Increment, Ldcpi, Operation rr ← rr +