CPU Architecture
September 5, 2002
Document #: 38-12010 CY Rev. ** CMS Rev. 3.20
23
Examples
:
2.3.5
Destination Indexed
The result of an instruction using this addressing mode is
placed within either the RAM memory space or the regis-
ter space. Operand 1 is added to the X register forming
the address that points to the location of the result. The
source for the instruction is the A register. Arithmetic
instructions require two sources, the second source is
the location specified by Operand 1 added with the X
register. Instructions using this addressing mode are two
bytes in length.
Example
:
2.3.6
Destination Direct Immediate
The result of an instruction using this addressing mode is
placed within either the RAM memory space or the regis-
ter space. Operand 1 is the address of the result. The
source for the instruction is Operand 2, which is an
immediate value. Arithmetic instructions require two
sources, the second source is the location specified by
Operand 1. Instructions using this addressing mode are
three bytes in length.
Examples
:
2.3.7
Destination Indexed Immediate
The result of an instruction using this addressing mode is
placed within either the RAM memory space or the regis-
ter space. Operand 1 is added to the X register to form
the address of the result. The source for the instruction is
Operand 2, which is an immediate value. Arithmetic
instructions require two sources, the second source is
the location specified by Operand 1 added with the X
register. Instructions using this addressing mode are
three bytes in length.
ADD
[7],
A
;In this case, the
;value in the memory
;location at address
;7 is added with the
;Accumulator, and the
;result is placed in
;the memory location
;at address 7. The
;Accumulator is
;unchanged.
MOV
REG[8], A
;In this case, the
;Accumulator is moved
;to the register
;space location at
;address 8. The
;Accumulator is
;unchanged.
Table 17:
Destination Indexed
Opcode
Operand 1
Instruction
Destination Index
ADD
[X+7],
A
;In this case, the value
;in the memory location
;at address X+7 is added
;with the Accumulator,
;and the result is placed
;in the memory location
;at address x+7. The
;Accumulator is
;unchanged.
Table 18:
Destination Direct Immediate
Opcode
Operand 1
Operand 2
Instruction
Destination Address Immediate Value
ADD
[7],
5
;In this case, value in
;the memory location at
;address 7 is added to
;the immediate value of
;5, and the result is
;placed in the memory
;location at address 7.
MOV
REG[8], 6
;In this case, the
;immediate value of 6 is
;moved into the register
;space location at
;address 8.
Table 19:
Destination Indexed Immediate
Opcode
Operand 1
Operand 2
Instruction
Destination Index
Immediate Value
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