ST6369 datasheet(48/71 Pages) STMICROELECTRONICS

48 / 71 page

SOFTWARE DESCRIPTION (Continued)

Instruction Set

The ST6369 Core has a set of 40 basic instruc-

tions. When these instructions are combined with

nine addressing modes, 244 usabl e opcodes can

be obtained. They can be divided into six different

types:l oad/store, arithmetic/l ogic, conditional

branch, control instructions, jump/cal l , bit ma-

nipul ation. The fol l owing paragraphs describe the

different types.

Al l the instructions within a given type are pre-

sented in individual tabl es.

Load & Store. These instructions use one,two or

three bytes in rel ation with the addressing mode.

One operand is the Accumul ator for LOAD and the

other operand is obtained from data memory using

one of the addressing modes.

For Load Immediate one operand can be any of the

256 data space bytes whil e the other is al ways

immediate data. See Tabl e 12.

Instruction

Addressing Mode

Bytes

Cycles

Flags

LD A, X

Short Direct

∆

LD A, Y

Short Direct

∆

LD A, V

Short Direct

∆

LD A, W

Short Direct

∆

LD X, A

Short Direct

∆

LD Y, A

Short Direct

∆

LD V, A

Short Direct

∆

LD W, A

Short Direct

∆

LD A, rr

Direct

∆

LD rr, A

Direct

∆

LD A, (X)

Indirect

∆

LD A, (Y)

Indirect

∆

LD (X), A

Indirect

∆

LD (Y), A

Indirect

∆

LDI A, #N

Immediate

∆

LDI rr, #N

Immediate

Notes:

X,Y. Indirect Register Pointers, V & W Short Direct Registers

# . Immediate data (stored in ROM memory)

rr.

Data space register

∆ . Affected

* . Not Affected

Table 12. Load & Store Instructions

ST6369

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