Renesas R8C/17 Betriebsanweisung PDF herunterladen (Seite 42)

SmartBook for Renesas R8C/Tiny Microcontrollers

www.MightyMicons.com

Chapter 4. Addressing Modes

4.1 Introduction:

The facility to define the data that should be operated on and the target memory

location plays an important role in the instruction set of the microcontrollers.

With more options, the instruction set becomes very friendly to the system

designers. The instruction set of the R8C/Tiny micons sports versatile and flexible

addressing modes to empower the designers take control on the program flow

without much efforts.

The micons have three types of addressing: General instruction addressing,

Special instruction addressing and Bit instruction addressing. Because of this,

the designers can access any memory location in the address range of 00000H to

FFFFFH in many ways. In addition, the bit location of all the bytes within this

range can also be defined and used in the processing.

Within the general instruction addressing group, following are the options:

1. Immediate.

2. Register direct.

3. Absolute.

4. Address register indirect.

5. Address register relative.

6. SB relative.

7. FB relative.

8. Stack pointer relative.

When using immediate kind of addressing, the

data that is to be operated on should be

included within the instruction structure.

This immediate data can be represented

in many formats: single byte, 16 and 20

bits. For the register direct mode, the

contents of the registers R0-R3 and A0,

A1 become data for the operations.

The

instruction set of

the R8C/Tiny micons

sports versatile and flexible

addressing modes to empower the

designers take control on the pro-

gram flow without much efforts. The

designers can access

any memory location

in the address range of

00000H to FFFFFH in

many ways.

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