GMS30C2116 Datasheet, PDF (270/322 Pages) Hynix Semiconductor – USERS MANUAL

A-96
Load Word (stack address mode)
Appendix A. Instruction Set Details
LDW.S
Format:
RRdis format
15
OP-code 1001 01
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:
LDW.S Rd, Rs, dis
Description:
The Load instruction of stack address mode transfers data from the addressed memory
location, Ld is used as an address, into a register Rs.
The content of the destination register Rd is used as stack address, then Rd is incremented
by dis regardless of any exception occurred.
Operation:
Rs := Rd^;
Rd := Rd + dis;
Exceptions:
None.