FMOVEM FMOVEM
Move Multiple Data Registers
through higher addresses. After each register is stored, the address register is incre-
mented by 12 (the size of an extended precision number in memory). When the op-
eration is complete, the address register points to the byte immediately following the
image of the last floating-point data register loaded. The order of the transfer is the
same as for the control addressing modes: FP7-FP0.
Status Register: Not Affected. Note that the FMOVEM instruction provides the only mech-
anism for moving a floating-point data item between the FPCP and memory without
performing any data conversions or affecting the condition code and exception status
bits.
Instruction Format:
15 14 13
1 1 1
! 1 dr
12 11 10 9 8 7 6 5 4 3 2 1 0
I COPROCESSOR EFFECTIVE ADDRESS
1 ID 0 0 0 MODE I REGISTER
MODE I 0 I 0 0 REG,STERLIST
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 operation:
Memory-to-Register
Addressing Mode Mode
Dn
An
(An) 010
(An) + 011
- (An)
(d16,An)
101
(ds,An,Xn} 110
(bd,An,Xn) 110
([bd,An,Xn],od) 110
([bd,An],Xn,od) 110
Register
reg. number:An
reg. number:An
reg. number:An
reg. number:An
reg. number:An
reg. number:An
reg. number:An
Addressing Mode Mode Register
(xxx).W 111
O00
(xx×).L 111 001
#<data>
--
--
(d16,PC) 111 010
(ds,PC,Xn) 111 011
(bd,PC,Xn) 111 011
([bd,PC,Xn},od) 111 011
([bd,PC],Xn,od) 111 011
MC68881/MC68882 USER'S MANUAL FREESCALE
4-75
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