S3C9234 Datasheet, PDF (101/214 Pages) Samsung semiconductor – 8-Bit CMOS Microcontroller

SAM88RI INSTRUCTION SET
S3C9234/P9234
LDCI/LDEI — Load Memory and Increment
LDCI/LDEI
Operation:
Flags:
Format:
dst,src
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.
No flags are affected.
opc dst | src
Bytes
2
Cycles
10
Opcode
(Hex)
E3
Addr Mode
dst src
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
LDEI
R8,@RR6
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
; 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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