Zilog Z08470 Manual do Utilizador Página 137

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UM008007-0715 Z80 Instruction Description
Z80 CPU
User Manual
125
EX (SP), HL
Operation
H (SP+1), L (SP)
Op Code
EX
Operands
(SP), HL
Description
The low-order byte contained in register pair HL is exchanged with the contents of the
memory address specified by the contents of register pair SP (Stack Pointer), and the high-
order byte of HL is exchanged with the next highest memory address (SP+1).
Condition Bits Affected
None.
Example
If the HL register pair contains 7012h, the SP register pair contains 8856h, the memory
location
8856h contains byte 11h, and memory location 8857h contains byte 22h, then
the instruction EX (SP), HL results in the HL register pair containing number
2211h,
memory location
8856h containing byte 12h, memory location 8857h containing byte
70h and Stack Pointer containing 8856h.
M Cycles T States 4 MHz E.T.
5 19 (4, 3, 4, 3, 5) 4.75
11 0 11010
E3
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