Datasheet

dsPIC33FJ12GP201/202
DS70264E-page 46 © 2007-2011 Microchip Technology Inc.
TABLE 4-22: FUNDAMENTAL ADDRESSING MODES SUPPORTED
4.3.3 MOVE AND ACCUMULATOR
INSTRUCTIONS
Move instructions and the DSP accumulator class of
instructions provide a greater degree of addressing
flexibility than other instructions. In addition to the
addressing modes supported by most MCU instruc-
tions, move and accumulator instructions also support
Register Indirect with Register Offset Addressing
mode, also referred to as Register Indexed mode.
In summary, the following addressing modes are
supported by move and accumulator instructions:
• Register Direct
• Register Indirect
• Register Indirect Post-modified
• Register Indirect Pre-modified
• Register Indirect with Register Offset (Indexed)
• Register Indirect with Literal Offset
• 8-bit Literal
• 16-bit Literal
4.3.4 MAC INSTRUCTIONS
The dual source operand DSP instructions (CLR, ED,
EDAC, MAC, MPY, MPY.N, MOVSAC, and MSC), also
referred to as MAC instructions, use a simplified set of
addressing modes to allow the user application to
effectively manipulate the data pointers through register
indirect tables.
The two-source operand prefetch registers must be
members of the set {W8, W9, W10, W11}. For data
reads, W8 and W9 are always directed to the X RAGU,
and W10 and W11 are always directed to the Y AGU.
The effective addresses generated (before and after
modification) must, therefore, be valid addresses within
X data space for W8 and W9 and Y data space for W10
and W11.
In summary, the following addressing modes are
supported by the MAC class of instructions:
• Register Indirect
• Register Indirect Post-Modified by 2
• Register Indirect Post-Modified by 4
• Register Indirect Post-Modified by 6
• Register Indirect with Register Offset (Indexed)
4.3.5 OTHER INSTRUCTIONS
In addition to the addressing modes outlined previ-
ously, some instructions use literal constants of various
sizes. For example, BRA (branch) instructions use
16-bit signed literals to specify the branch destination
directly, whereas the DISI instruction uses a 14-bit
unsigned literal field. In some instructions, such as ADD
Acc, the source of an operand or result is implied by
the opcode itself. Certain operations, such as NOP, do
not have any operands.
Addressing Mode Description
File Register Direct The address of the file register is specified explicitly.
Register Direct The contents of a register are accessed directly.
Register Indirect The contents of Wn forms the Effective Address (EA.)
Register Indirect Post-Modified The contents of Wn forms the EA. Wn is post-modified (incremented or
decremented) by a constant value.
Register Indirect Pre-Modified Wn is pre-modified (incremented or decremented) by a signed constant value
to form the EA.
Register Indirect with Register Offset
(Register Indexed)
The sum of Wn and Wb forms the EA.
Register Indirect with Literal Offset The sum of Wn and a literal forms the EA.
Note: For the MOV instructions, the addressing
mode specified in the instruction can differ
for the source and destination EA.
However, the 4-bit Wb (Register Offset)
field is shared by both source and
destination (but typically only used by
one).
Note: Not all instructions support all the
addressing modes given above. Individual
instructions may support different subsets
of these addressing modes.
Note: Register Indirect with Register Offset
Addressing mode is available only for W9
(in X space) and W11 (in Y space).