Freescale Semiconductor MC68881 - Page 150

4
FSAVE
Save Internal State
(Privileged Instruction}
FSAVE
Instruction Fields:
Coprocessor ID Field -- Specifies which coprocessor in the system is to execute this
instruction. Freescale assemblers default to ID = 1 for the FPCP.
Effective Address Field -- Determines the addressing mode for the state frame. Only
predecrement or control-alterable addressing modes are allowed as shown:
Addressing Mode Mode Register
Dn -- --
An -- --
(An) 010 reg.
number:An
(An)+ -- --
- (An) 100 reg.
number:An
(d16,An) 101 reg. number:An
(d8,An,Xn) 110 reg. number:An
(bd,An,Xn} 110
reg. number:An
([bd,An,Xn],od) 110 reg.
number:An
([bd,An],Xn,od) 110 reg. number:An
Addressing Mode Mode ! Register
000
(xxx).W
(xxx).L
#<data>
(d16,PC)
(ds,PC,Xn)
(bd,PC,Xn)
([bd,PC,Xn],od)
([bd,PC],Xn,od)
111
111
- I
- p
- !
- L
001
FREESCALE
4-92
MC68881/MC68882 USER'S MANUAL