Microcomputer having user mode interrupt function and supervisor

Details Microcomputer having user mode interrupt function and supervisor Microcomputer having user mode interrupt function and supervisor

1997-04-28

1999-06-01

Sheikh, Ayaz R.

395733, G06F 946

Patent

active

059095822

ABSTRACT:
In a microcomputer including a central processing unit (CPU), a user mode interrupt control circuit for generating a user mode interrupt request signal and transmitting the user mode interrupt request signal to the CPU, and a supervisor mode interrupt control circuit for generating a supervisor interrupt request signal, a selector circuit is connected to the CPU, the user mode interrupt control circuit and the supervisor mode interrupt control circuit. When the selector circuit is in a first state, the supervisor mode interrupt request signal is transmitted from the supervisor mode interrupt control circuit directly to the CPU. When the selector is in a second state, the supervisor mode interrupt request signal is transmitted from the supervisor mode interrupt control circuit via the user mode interrupt control circuit to the CPU.

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