ST20C4 datasheet(118/212 Pages) STMICROELECTRONICS

Il numero della parte	ST20C4

Spiegazioni elettronici	Instruction Set Reference Manual

PDF	212 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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loop end

Code: 22 F1

Description: Adjust loop count and index, and do a conditional jump. Initially Areg

contains the byte offset from the first byte following this instruction to the loop start and

Breg contains a pointer to a loop end data structure, the first word of which is the loop

index and the second is the loop count. The count is decremented and, if the result is

greater than zero, the index is incremented and a jump to the start of the loop is taken.

The offset to the start of the loop is given as a positive number that is subtracted from

the instruction pointer.

Definition:

if (word[Breg @ le.Count]

> 1)

{

word

′[Breg @ le.Count] ← word[Breg @ le.Count] − 1

word

′[Breg @ le.Index] ← word[Breg @ le.Index] + 1

Iptr

′← next instruction − Areg

}

Areg

′← undefined

Breg

′← undefined

Creg

′← undefined

Error signals: none

Comments:

Secondar y instruction.

Instruction is a descheduling point.

Instruction is a timeslice point.

ST20C4 Scheda tecnica(PDF) 118 Page - STMicroelectronics