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INSTRUCTION SET S3C8245/P8245/C8249/P8249
6-52
LDC/LDE — Load Memory
LDC/LDE dst,src
Operation: dst ← src
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:
Bytes Cycles Opcode
(Hex)
Addr Mode
dst src
1. opc dst | src 2 10 C3 r Irr
2. opc src | dst 2 10 D3 Irr r
3. opc dst | src XS 3 12 E7 r XS [rr]
4. opc src | dst XS 3 12 F7 XS [rr] r
5. opc dst | src XL
L
XL
H
4 14 A7 r XL [rr]
6. opc src | dst XL
L
XL
H
4 14 B7 XL [rr] r
7. opc dst | 0000 DA
L
DA
H
4 14 A7 r DA
8. opc src | 0000 DA
L
DA
H
4 14 B7 DA r
9. opc dst | 0001 DA
L
DA
H
4 14 A7 r DA
10. opc src | 0001 DA
L
DA
H
4 14 B7 DA r
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.