ST7MC1K2 datasheet(309/371 Pages) STMICROELECTRONICS

309 / 371 page

Obsolete

Product(s)

- Obsolete

Product(s)

ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto

Instruction set

309/371

These prebytes enable instruction in Y as well as indirect addressing modes to be

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

addressing mode. The prebytes are:

11.2.2

Illegal opcode reset

In order to provide enhanced robustness to the device against unexpected behavior, a

system of illegal opcode detection is implemented. If a code to be executed does not

correspond to any opcode or prebyte value, a reset is generated. This, combined with the

Watchdog, allows the detection and recovery from an unexpected fault or interference.

Note:

A valid prebyte associated with a valid opcode forming an unauthorized combination does

not generate a reset.

PDY 90

Replace an X based instruction using immediate, direct, indexed, or

inherent addressing mode by a Y one.

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.

PIY 91

Replace an instruction using X indirect indexed addressing mode by

a Y one.

Obsolete

Product(s)

- Obsolete

Product(s)

ST7MC1K2 데이터시트(PDF) 309 Page - STMicroelectronics