CYWUSB6953_10 datasheet(15/68 Pages) CYPRESS

15 / 68 page

CYRF69103

Document #: 001-07611 Rev *F

Page 15 of 68

12. Addressing Modes

Examples of the different addressing modes are discussed in

this section and example code is given.

12.1 Source Immediate

The result of an instruction using this addressing mode is placed

in the A register, the F register, the SP register, or the X register,

which is specified as part of the instruction opcode. Operand 1

is an immediate value that serves as a source for the instruction.

Arithmetic instructions require two sources. Instructions using

this addressing mode are two bytes in length.

Examples

12.2 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

addressing mode are two bytes in length.

Examples

12.3 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

in length.

Examples

12.4 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

Arithmetic instructions require two sources; the second source is

the location specified by Operand 1. Instructions using this

addressing mode are two bytes in length.

Examples

Table 12-1. Source Immediate

Opcode

Operand 1

Instruction

Immediate Value

ADD

7 In this case, the immediate value of 7 is

added with the Accumulator, and the result

is placed in the Accumulator.

MOV

8 In this case, the immediate value of 8 is

moved to the X register.

AND

9 In this case, the immediate value of 9 is

logically ANDed with the F register and the

result is placed in the F register.

Table 12-2. Source Direct

Opcode

Operand 1

Instruction

Source Address

ADD

[7]

In this case, the value in the RAM

memory location at address 7 is

added with the Accumulator, and the

result is placed in the Accumulator.

MOV

REG[8] In this case, the value in the register

space at address 8 is moved to the X

Table 12-3. Source Indexed

Opcode

Operand 1

Instruction

Source Index

ADD

[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

REG[X+8] In this case, the value in the

moved to the X register.

Table 12-4. Destination Direct

Opcode

Operand 1

Instruction

Destination Address

ADD

[7],

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],

In this case, the Accumulator is

moved to the register space

location at address 8. The

Accumulator is unchanged.

[+] Feedback

CYWUSB6953 Datasheet(PDF) 15 Page - Cypress Semiconductor

CYWUSB6953 Datasheet(HTML) 15 Page - Cypress Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68

Datasheet Download

Link URL