S3F80JB

INSTRUCTION SET

 

 

LDCI/LDEI — Load Memory and Increment

LDCI/LDEI dst,src

Operation: dst src

rr rr + 1

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

LDCI refers to program memory and LDEI refers to external data memory. The assembler makes 'Irr' even for program memory and odd for data memory.

Flags: No flags are affected.

Format:

opc

dst src

Bytes

Cycles

Opcode

Addr Mode

 

 

(Hex)

dst

src

2

10

E3

r

Irr

Examples: Given: R6 = 10H, R7 = 33H, R8 = 12H, program memory locations 1033H = 0CDH and

1034H = 0C5H; external data memory locations 1033H = 0DDH and 1034H = 0D5H:

LDCI

R8,@RR6

;

0CDH (contents of program memory location 1033H) is loaded

 

 

;

into R8 and RR6 is incremented by one (RR6 RR6 + 1)

 

 

;

R8 = 0CDH, R6 = 10H, R7 = 34H

LDEI

R8,@RR6

;

0DDH (contents of data memory location 1033H) is loaded

 

 

;

into R8 and RR6 is incremented by one (RR6 RR6 + 1)

 

 

;

R8 = 0DDH, R6 = 10H, R7 = 34H

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Image 183
Samsung S3F80JB manual LDCI/LDEI Load Memory and Increment, LDCI/LDEI dst,src Operation dst ← src, Rr ← rr +