Data Memory Read (Direct Address) - Analog Devices adsp-2100 Manual

Syntax:
reg = DM ( <addr> ) ;
Permissible registers
AX0 MX0 SI
AX1 MX1 SE
AY0 MY0 SR1
AY1 MY1 SR0
AR MR2 I0-I7
MR1 M0-M7
MR0 L0-L7
Example:
SI = DM( ad_port0 );
Description:
The Read instruction moves the contents of the data
memory location to the destination register. The addressing mode is direct
addressing (designated by an immediate address value or by a label). The
data memory address is stored directly in the instruction word as a full 14-
bit field. The contents of the source are always right-justified in the
destination register after the read (bit 0 maps to bit 0).
Note that whenever MR1 is loaded with data, it is sign-extended into
MR2.
Status Generated:
Instruction Format:
Data Memory Read (Direct Address), Instruction Type 3:
23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 0 0 0 RGP
ADDR contains the direct address to the source location in Data Memory.
RGP (Register Group) and REG (Register) select the destination register
according to the Register Selection Table (see Appendix A).

DATA MEMORY READ (Direct Address)

SB
PX
ASTAT
MSTAT
IMASK
ICNTL
None affected.
ADDR
CNTR
OWRCNTR (write only)
RX0
RX1
TX0
TX1
IFC(write only)
MOVE
15
REG
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