ST7FOXU0 datasheet(83/123 Pages) STMICROELECTRONICS

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ST7FOXU0

Instruction set

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Instruction set

11.1

ST7 addressing modes

The ST7 core features 17 different addressing modes which can be classified in seven main

groups:

The ST7 instruction set is designed to minimize the number of bytes required per

instruction: To do so, most of the addressing modes may be subdivided in two submodes

called long and short:

●

Long addressing mode is more powerful because it can use the full 64 Kbyte address

space, however it uses more bytes and more CPU cycles.

●

Short addressing mode is less powerful because it can generally only access page

zero (0000h - 00FFh range), but the instruction size is more compact, and faster. All

memory to memory instructions use short addressing modes only (CLR, CPL, NEG,

BSET, BRES, BTJT, BTJF, INC, DEC, RLC, RRC, SLL, SRL, SRA, SWAP)

The ST7 Assembler optimizes the use of long and short addressing modes.

Table 31.

Description of addressing modes

Addressing mode

Example

Inherent

nop

Immediate

ld A,#$55

Direct

ld A,$55

Indexed

ld A,($55,X)

Indirect

ld A,([$55],X)

Relative

jrne loop

Bit operation

bset

byte,#5

Table 32.

ST7 addressing mode overview

Mode

Syntax

Destination/

source

Pointer

address

Pointer

size

Length

(bytes)

Inherent

nop

+ 0

Immediate

ld A,#$55

+ 1

Short

Direct

ld A,$10

00..FF

+ 1

Long

Direct

ld A,$1000

0000..FFFF

+ 2

No Offset

Direct

Indexed

ld A,(X)

00..FF

+ 0 (with X register)

+ 1 (with Y register)

Short

Direct

Indexed

ld A,($10,X)

00..1FE

+ 1

Long

Direct

Indexed

ld A,($1000,X)

0000..FFFF

+ 2

Short

Indirect

ld A,[$10]

00..FF

byte

+ 2

Long

Indirect

ld A,[$10.w]

0000..FFFF

00..FF

word

+ 2

Short

Indirect

Indexed

ld A,([$10],X)

00..1FE

00..FF

byte

+ 2

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