ST6200C datasheet(53/100 Pages) STMICROELECTRONICS

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9.3 INSTRUCTION SET

The ST6 offers a set of 40 basic instructions

which, when combined with nine addressing

modes, yield 244 usable opcodes. They can be di-

vided into six different types: load/store, arithme-

tic/logic, conditional branch, control instructions,

jump/call, and bit manipulation. The following par-

agraphs describe the different types.

All the instructions belonging to a given type are

presented in individual tables.

Load & Store. These instructions use one, two or

three bytes depending on the addressing mode.

For LOAD, one operand is the Accumulator 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 while the other is always

immediate data.

Table 15. Load & Store Instructions

Legend:

X, Y

Index Registers,

V, W Short Direct Registers

Immediate data (stored in ROM memory)

Data space register

∆

Affected

Not Affected

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

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