Motorola CPU32 Reference Manual page 74

ABCD
Add Decimal with Extend
Instruction fields:
Register Rx field - Specifies the destination register:
If RIM
=
0, specifies a data register
If RIM
=
1, specifies an address register for predecrement addressing mode
RIM field - Specifies the operand addressing mode:
° -
the operation is data register to data register
1 - the operation is memory to memory
Register Ry field - Specifies the source register:
If RIM
=
0, specifies a data register
If RIM
=
1, specifies an address register for predecrement addressing mode
CPU32 REFERENCE MANUAL INSTRUCTION SET
ABCD
MOTOROLA
4-21
III