ST20CX datasheet(118/212 Pages) STMICROELECTRONICS

tên linh kiện	ST20CX

Giải thích chi tiết về linh kiện	Instruction Set Reference Manual

PDF	212 Pages

Scroll/Zoom	100%

nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

Trang chủ	http://www.st.com

Logo

118 / 212 page

lend

118/212

lend

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.

ST20CX bảng dữ liệu(PDF) 118 Page - STMicroelectronics