JPS6125644U

JPS6125644U - microcomputer

Info

Publication number: JPS6125644U
Application number: JP10992684U
Authority: JP
Inventors: 義明牧井
Original assignee: 日本電気株式会社
Priority date: 1984-07-20
Filing date: 1984-07-20
Publication date: 1986-02-15

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例のブロック図、第２図は従来
のマイクロ・コンピュータ内蔵スタックポインタ回路及
びその周辺回路のブロック図である。図において、１・・・・・・ＲＡＭ，２・・・・・・メ
モリアドレスポインタ回路、３・・・・・・スタックポ
インタレジスタ回路、４・・・・・・インクリメント・
デイクリメント回路、５−・・・・・出力ラッチ回路、
６・・・・・・入力ラッチ回路、７・・・・・・データ
・パス、８・・・・・・初期値設定回路、，１０・・・
・・・システム・リセット時トリがー信号、１１・・・
・・・初期値アドレス・データ、てある。FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional microcomputer built-in stack pointer circuit and its peripheral circuits. In the figure, 1...RAM, 2...memory address pointer circuit, 3...stack pointer register circuit, 4...increment...
Decrement circuit, 5-...output latch circuit,
6...Input latch circuit, 7...Data path, 8...Initial value setting circuit, 10...
...Trigger signal at system reset, 11...
...Initial value address data.

Claims

[Scope of utility model registration request]

In a microcomputer that has a function of saving data in a specific register when executing an interrupt processing or subroutine call instruction, there is a stack memory for saving data stored in the n-register, and a stack for storing address information of this stack memory. It includes a pointer register and an initial value setting circuit for the stack pointer register, and initializes the stack pointer register upon system reset, and saves data stored in the specific register from an address specified by the initialized stack pointer register. A microcomputer characterized by starting operation.