ST72F324J6TCX Ver la hoja de datos (PDF) - STMicroelectronics

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ST72F324J6TCX

8-bit MCU for automotive, 3.8 to 5.5V operating range with 8 to 32 Kbyte Flash, 10-bit ADC, 4 timers, SPI, SCI

STMicroelectronics 

ST72324xx-Auto

Instruction set

Using a prebyte

The instructions are described with one to four opcodes.

In order to extend the number of available opcodes for an 8-bit CPU (256 opcodes), three

different prebyte opcodes are defined. These prebytes modify the meaning of the instruction

they precede.

The whole instruction becomes:

PC-2 End of previous instruction

PC-1 Prebyte

PC

Opcode

) PC+1

Additional word (0 to 2) according to the number of bytes required to compute the

effective address

t(s These prebytes enable the instruction in Y as well as indirect addressing modes to be

c implemented. They precede the opcode of the instruction in X or the instruction using direct

u addressing mode. The prebytes are:

rod PDY 90 Replace an X based instruction using immediate, direct, indexed, or inherent

P addressing mode by a Y one.

solete PIX 92

Replace an instruction using direct, direct bit, or direct relative addressing mode

to an instruction using the corresponding indirect addressing mode.

It also changes an instruction using X indexed addressing mode to an instruction

using indirect X indexed addressing mode.

Obsolete Product(s) - Ob PIY 91 Replace an instruction using X indirect indexed addressing mode by a Y one.

Doc ID 13841 Rev 1

143/193

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