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INSTRUCTION SET
LDW
— Load Word
LDW
dst,src
dst ← src
Operation:
The contents of the source (a word) are loaded into the destination. The contents of the source are
unaffected.
Flags:
No flags are affected.
Format:
opc
opc
Examples:
Given: R4 = 06H, R5 = 1CH, R6 = 05H, R7 = 02H, register 00H = 1AH,
register 01H = 02H, register 02H = 03H, and register 03H = 0FH:
LDW
LDW
LDW
LDW
LDW
LDW
In the second example, please note that the statement "LDW 00H,02H" loads the contents of the
source word 02H, 03H into the destination word 00H, 01H. This leaves the value 03H in general
register 00H and the value 0FH in register 01H.
The other examples show how to use the LDW instruction with various addressing modes and
formats.
6-58
src
dst
dst
src
→
RR6,RR4
→
00H,02H
→
RR2,@R7
→
04H,@01H
→
RR6,#1234H
→
02H,#0FEDH
Bytes
Cycles
3
4
R6 = 06H, R7 = 1CH, R4 = 06H, R5 = 1CH
Register 00H = 03H, register 01H = 0FH,
register 02H = 03H, register 03H = 0FH
R2 = 03H, R3 = 0FH,
Register 04H = 03H, register 05H = 0FH
R6 = 12H, R7 = 34H
Register 02H = 0FH, register 03H = 0EDH
Opcode
Addr Mode
(Hex)
dst
8
C4
RR
8
C5
RR
8
C6
RR
S3C80A5B
src
RR
IR
IML
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