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Call and Return Group
Call and Return Group
- Gunther Strube
Owned by Gunther Strube
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Mnemonic Symbolic Flags (bit 7-0) Instruction Number Number of Number of Comments
operation S Z . H . V N C opcode of bytes M cycles T states
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CALL nn (SP-1) <- PCh * * X * X * * * 11 001 101 (CDh) 3 5 17
(SP-2) <- PCl -- <nn> --
SP <- SP-2
PC <- nn
CALL cc,nn if not cc, continue * * X * X * * * 11 <cc> 100 3 5 10 if cc is false
else, CALL nn -- <nn> --- 3 5 17 if cc iss true
RETI return from * * X * X * * * 11 101 101 (EDh) 2 4 14 cc: condition
interrupt 01 001 101 (4Dh) 000 NZ not zero
001 Z zero
RETN return from non- * * X * X * * * 11 101 101 (EDh) 2 4 14 010 NC not carry
maskable interrupt 01 000 101 (45h) 011 C carry
100 PO parity odd
RET PCl <- (SP) * * X * X * * * 11 001 001 (C9h) 1 3 10 101 PE parity even
PCh <- (SP+1) 110 P sign posit.
SP <- SP+2 111 M sign nega.
RET cc if not cc, continue * * X * X * * * 11 <cc> 000 1 1 5 if cc is false
else, RET 1 3 11 if cc is true
RST p (SP-1) <- PCh * * X * X * * * 11 <t> 111 1 3 11 t: p:
(SP-2) <- PCl 000 00h
SP <- SP-2 001 08h
PCh <- 0 010 10h
PCl <- p 011 18h
100 20h
101 28h
110 30h
111 38h