Zilog Z08470 - Manual (Page 136)

Z80 Instruction Set UM008007-0715
124
Z80 CPU
User Manual
EXX
Operation
(BC) ↔ (BC′), (DE) ↔ (DE'), (HL) ↔ (HL′)
Op Code
EXX
Operands
None.
Description
Each 2-byte value in register pairs BC, DE, and HL is exchanged with the 2-byte value in
BC', DE', and HL', respectively.
Condition Bits Affected
None.
Example
If register pairs BC, DE, and HL contain 445Ah , 3DA2h , and 8859h , respectively, and
register pairs BC', DE', and HL' contain 0988h , 9300h , and 00E7h , respectively, then
upon the execution of an EXX instruction, BC' contains 0988h ; DE' contains 9300h ; HL
contains 00E7h ; BC' contains 445Ah ; DE' contains 3DA2h ; and HL' contains 8859h .
M Cycles T States 4 MHz E.T.
1 4 1.00
1 1 1 0 1 0 0 1 D9