Cypress CY7C638xx Manuale Utente

Document 38-08035 Rev. *K

Page 11 of 83

7.2.6  Destination Direct Source Immediate
The result of an instruction using this addressing mode is placed

within the RAM memory space or the register space. Operand 1

is the address of the result. The source of 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.

7.2.7  Destination Indexed Source Immediate
The result of an instruction using this addressing mode is placed

within the RAM memory space or the register space. Operand 1

is added to the X register to form the address of the result. The

source of 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.

7.2.8  Destination Direct Source Direct
The result of an instruction using this addressing mode is placed

within the RAM memory. Operand 1 is the address of the result.

Operand 2 is an address that points to a location in the RAM

memory that is the source for the instruction. This addressing

mode is only valid on the MOV instruction. The instruction using

this addressing mode is three bytes in length.

.

7.2.9  Source Indirect Post Increment
The result of an instruction using this addressing mode is placed

in the Accumulator. Operand 1 is an address pointing to a

location within the memory space, which contains an address

(the indirect address) for the source of the instruction. The

indirect address is incremented as part of the instruction

execution. This addressing mode is only valid on the MVI

instruction. The instruction using this addressing mode is two

bytes in length. Refer to the PSoC Designer: Assembly
Language User Guide

 for further details on MVI instruction.

7.2.10  Destination Indirect Post Increment
The result of an instruction using this addressing mode is placed

within the memory space. Operand 1 is an address pointing to a

location within the memory space, which contains an address

(the indirect address) for the destination of the instruction. The

indirect address is incremented as part of the instruction

execution. The source for the instruction is the Accumulator. This

addressing mode is only valid on the MVI instruction. The

instruction using this addressing mode is two bytes in length.

Instruction

Destination Address

Immediate Value

ADD [7]

5

The 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

The immediate value of 6 is moved into the 
register space location at address 8.

Instruction

Destination Index

Immediate Value

ADD

[X+7]

5

The value in the memory location at 
address X+7 is added with the 
immediate value of 5, and the result 
is placed in the memory location at 
address X+7.

MOV

REG[X+8]

6

The immediate value of 6 is moved 
into the location in the register space 
at address X+8.

Instruction

Destination Address

Source Address

MOV

[7]

[8]

The value in the memory location at address 8 
is moved to the memory location at address 7.

Instruction

Source Address Address

MVI

A

[8]

The value in the memory location at address 
8 is an indirect address. The memory location 
pointed to by the indirect address is moved 
into the Accumulator. The indirect address is 
then incremented.

Instruction

Destination Address Address

MVI

[8]

A

The value in the memory location at 
address 8 is an indirect address. The 
Accumulator is moved into the memory 
location pointed to by the indirect 
address. The indirect address is then 
incremented.