CY7C601xx
CY7C602xx
Document 38-16016 Rev. *C
Page 10 of 62
Examples
Source Direct
The result of an instruction using this addressing mode is
placed in either the A register or the X register, which is
specified as part of the instruction opcode. Operand 1 is an
address that points to a location in either the RAM memory
space or the register space that is the source for the
instruction. Arithmetic instructions require two sources; the
second source is the A register or X register specified in the
opcode. Instructions using this addressing mode are two bytes
in length.
Examples
Source Indexed
The result of an instruction using this addressing mode is
placed in either the A register or the X register, which is
specified as part of the instruction opcode. Operand 1 is added
to the X register forming an address that points to a location in
either the RAM memory space or the register space that is the
source for the instruction. Arithmetic instructions require two
sources; the second source is the A register or X register
specified in the opcode. Instructions using this addressing
mode are two bytes.
Examples
Destination Direct
The result of an instruction using this addressing mode is
placed within either the RAM memory space or the register
space. Operand 1 is an address that points to the location of
the result. The source for the instruction is either the A register
or the X register, which is specified as part of the instruction
opcode. Arithmetic instructions require two sources; the
second source is the location specified by Operand 1. Instruc-
tions using this addressing mode are two bytes in length.
Examples
Destination Indexed
The result of an instruction using this addressing mode is
placed within either the RAM memory space or the register
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
ADD
A,
7
;In this case, the immediate value of 7 is added
with the Accumulator and the result is placed in
the Accumulator.
MOV
X,
8
;In this case, the immediate value of 8 is moved
to the X register.
AND
F,
9
;In this case, the immediate value of 9 is logi-
cally ANDed with the F register and the result is
placed in the F register.
Table 10.Source Direct
Opcode
Operand 1
Instruction
Source Address
ADD
A,
[7]
;In this case, the value in the RAM mem-
ory location at address 7 is added with
the Accumulator, and the result is placed
in the Accumulator.
MOV
X,
REG[8]
;In this case, the value in the register
space at address 8 is moved to the X
register.
Table 11.Source Indexed
Opcode
Operand 1
Instruction
Source Index
ADD
A,
[X+7]
;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 Accumulator.
MOV
X,
REG[X+8]
;In this case, the value in the register
space at address X + 8 is moved to
the X register.
Table 12.Destination Direct
Opcode
Operand 1
Instruction
Destination Address
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 13.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.
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