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INSTRUCTION SET
LDC/LDE
— Load Memory
LDC/LDE
dst,src
dst ← src
Operation:
This instruction loads a byte from program or data memory into a working register or vice-versa.
The source values are unaffected. LDC refers to program memory and LDE to data memory. The
assembler makes 'Irr' or 'rr' values an even number for program memory and odd an odd number
for data memory.
Flags:
No flags are affected.
Format:
1.
opc
2.
opc
3.
opc
4.
opc
5.
opc
6.
opc
7.
opc
8.
opc
9.
opc
10.
opc
NOTES:
1.
The source (src) or working register pair [rr] for formats 5 and 6 cannot use register pair 0–1.
2.
For formats 3 and 4, the destination address 'XS [rr]' and the source address 'XS [rr]' are each one
byte.
3.
For formats 5 and 6, the destination address 'XL [rr] and the source address 'XL [rr]' are each two
bytes.
4.
The DA and r source values for formats 7 and 8 are used to address program memory; the second set
of values, used in formats 9 and 10, are used to address data memory.
6-52
dst | src
src | dst
XS
dst | src
XS
src | dst
XL
dst | src
L
XL
src | dst
L
DA
dst | 0000
L
DA
src | 0000
L
DA
dst | 0001
L
DA
src | 0001
L
Bytes
2
2
3
3
XL
4
H
XL
4
H
DA
4
H
DA
4
H
DA
4
H
DA
4
H
S3F80P5_UM_ REV1.00
Cycles
Opcode
(Hex)
10
C3
10
D3
12
E7
12
F7
14
A7
14
B7
14
A7
14
B7
14
A7
14
B7
Addr Mode
dst
src
r
Irr
Irr
r
r
XS [rr]
XS [rr]
r
r
XL [rr]
XL [rr]
r
r
DA
DA
r
r
DA
DA
r
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