ST20C2 datasheet(118/212 Pages) STMICROELECTRONICS

Nome de Peças	ST20C2

Descrição Electrónicos	Instruction Set Reference Manual

PDF	212 Pages

Scroll/Zoom	100%

Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

Página de início	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.

ST20C2 Folha de dados(PDF) 118 Page - STMicroelectronics