GMS30C2216 Datasheet, PDF (301/320 Pages) Hynix Semiconductor – 16/32 BIT RISC/DSP

Appendix A. Instruction Set Details
Store Double Word (register address mode)
A-129
STD.R
Format:
LR format
15
OP-code
1101 101
87
43
0
s
Ld-code
Rs-code
s = 0: Rs-code encodes G0..G15 for Rs
s = 1: Rs-code encodes L0..L15 for Rs
Ld-code encodes L0..L15 for Ld
Notation:
STD.R Ld, Rs
Description:
The Store instruction of register address mode transfers data from a register pair Rs//Rsf
into the addressed memory location, Ld is used as an address.
The content of the destination register Ld is used as an address into memory address space.
Operation:
Ld^ := Rs;
(Ld + 4)^ := Rsf;
Exceptions:
None.