DP805X Ver la hoja de datos (PDF) - Digital Core Design

Número de pieza

componentes Descripción

Fabricante

DP805X

Pipelined High Performance Microcontroller

Digital Core Design 

DP805x Instructions set details

- 14 -

3. INSTRUCTIONS SET DETAILS

3.1. ACALL

Instruction: ACALL addr11

Function: Absolute call

Description:

ACALL unconditionally calls a subroutine located at the indicated

address. The instruction increments the PC twice to obtain the address

of the following instruction, then pushes the 16-bit result onto the stack

(low-order byte first) and increments the stack pointer twice. The

destination address is obtained by successively concatenating the five

high-order bits of the incremented PC, op code bits 7-5, and the second

byte of the instruction. The subroutine called must therefore start within

the same 2K block of program memory as the first byte of the

instruction following ACALL. No flags are affected.

Operation:

(PC)

← (PC) + 2

(SP)

← (SP) + 1

((SP)) ← (PC7-0)

(SP)

← (SP) + 1

((SP)) ← (PC15-8)

(PC10-0) ← page address

Bytes:

2

Cycles:

4

Encoding:

a10 a9 a8 1 0 0 0 1 a7 a6 a5 a4 a3 a2 a1 a0

All trademarks mentioned in this document

are trademarks of their respective owners.

http://www.DigitalCoreDesign.com

http://www.dcd.pl

Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.

Share Link: