M166 datasheet(39/127 Pages) SIEMENS

39 / 127 page

30Mar98@15:00h

Semiconductor Group

Version 1.2, 12.97

C166 Family Instruction Set

Instruction Description

ATOMIC

Begin ATOMIC Sequence

ATOMIC

Syntax

ATOMIC

op1

Operation

(count)

← (op1) [1 ≤ op1 ≤ 4]

Disable interrupts and Class A traps

DO WHILE ((count)

≠ 0 AND Class_B_trap_condition ≠ TRUE)

Next Instruction

(count)

← (count) - 1

END WHILE

(count) = 0

Enable interrupts and traps

Description

Causes standard and PEC interrupts and class A hardware traps to be

disabled for a specified number of instructions. The ATOMIC instruction

becomes immediately active such that no additional NOPs are required.

Depending on the value of op1, the period of validity of the ATOMIC

sequence extends over the sequence of the next 1 to 4 instructions being

executed after the ATOMIC instruction. All instructions requiring multiple

cycles or hold states to be executed are regarded as one instruction in this

sense. Any instruction type can be used with the ATOMIC instruction.

Note

The ATOMIC instruction must be used carefully (see introductory note).

The ATOMIC instruction is not available in the SAB 8XC166(W) devices.

E Not affected.

Z Not affected.

V Not affected.

C Not affected.

N Not affected.

Addressing Modes

Mnemonic

Format

Bytes

ATOMIC

#irang2

D1 :00##-0

Condition Flags

---

M166 Datasheet(PDF) 39 Page - Siemens Semiconductor Group

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