ZiLOG Z80380 User Manual page 33

Z
ILOG
4.2.7 Stack Pointer Relative Mode (SR) (Continued)
2. Load HL from location (SP – 4) in Extended mode, Long Word mode
SETC XM
DDIR LW
LD HL, (SP–4)
Before instruction execution
After instruction execution
Memory location
Address calculation: In Extended mode, FCH (–4 in Deci-
mal) encoding in the instruction is sign extended to a 32-
bit value before the address calculation, and calculation is
done in modulo 2 32 .
3. Load HL from location (SP + 10000H) in Extended mode, Long Word mode
SETC XM
DDIR IW,LW
LD HL, (SP+10000)
Before instruction execution
After instruction execution
Memory location
Address calculation: In Extended mode, 010000H encod-
ing in the instruction is sign extended to a 32-bit value
before the address calculation, and calculation is done in
32
modulo 2 .
4-8
;In Extended mode
;operate next instruction in Long Word mode
;Load into the HL from the
;contents of the memory location
;whose address is four less than
;the contents of SP.
HLz HL SPz
1234 5678 07FF
EFCD AB89 07FF
07FF7EFC 89
07FF7EFD AB
07FF7EFE CD
07FF7EFF EF
;In Extended mode,
;operate next instruction in Long Word mode
;with a word immediate data.
;Load into the HL from the
;contents of the memory location
;whose address is 10000H more than
;the contents of SP.
HLz HL SPz
1234 5678 07FF
EFCD AB89 07FF
08007F00 89
08007F01 AB
08007F02 CD
08007F03 EF
SP
7F00
7F00
07FF7F00
+ FFFFFFFC
07FF7EFC
SP
7F00
7F00
07FF7F00
+ 00010000
08007F00
Z380 ™
U ' M
SER S ANUAL
DC-8297-03