GMS30C2116 Datasheet, PDF (301/322 Pages) Hynix Semiconductor – USERS MANUAL

Appendix A. Instruction Set Details
Store (absolute address mode)
A-127
STxx.A
Format:
RRdis format
15
OP-code 1001 10
eS
DD
87
43
0
ds
Rd-code
Rs-code
dis1
dis2
s = 0: Rs-code encodes G0..G15 for Rs, s = 1: Rs-code encodes L0..L15 for Rs
d = 0: Rd-code encodes G0..G15 for Rd, d = 1: Rd-code encodes L0..L15 for Rd
S : Sign bit of dis, e = 0: dis = 20S // dis1(range -4,096..4,095)
e = 1: dis = 4S // dis1 // dis2 (range -268,435,456...268,435,455)
DD: D-code, D13..D12 encode data types at memory instructions
Notation:
STxx.A 0, Rs, dis
Description:
The Store instruction of absolute address mode transfers data from a register Rs or a
register pair Rs//Rsf into the addressed memory location, displacement dis is used as an
address.
The displacement dis is used as an address into memory address space. Rd must denote the
SR to differentiate this mode from the displacement address mode; the content of the SR is
not used.
Data type xx is with
BU: Byte unsigned HU: Halfword unsigned W: Word
BS: Byte singed HS: Halfword signed D: Double-word
Operation:
dis^ := Rs;
[(dis+4)^ := Rsf;]
Exceptions:
None.