Samsung 8-Bit Manual do Utilizador descarregar pdf (Página 125)

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101

S3C9228/P9228 SAM88RCRI INSTRUCTION SET

6-29

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 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

4 14 A7 r XL [rr]

6. opc src | dst

4 14 B7 XL [rr] r

7. opc dst | 0000

4 14 A7 r DA

8. opc src | 0000

4 14 B7 DA r

9. opc dst | 0001

4 14 A7 r DA

10. opc src | 0001

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.

1 2 ... 120 121 122 123 124 125 126 127 128 129 130 ... 461 462

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