公开(公告)号：US20020129234A1

公开(公告)日：2002-09-12

申请号：US09995251

申请日：2001-11-27

Applicant: STMicroelectronics S.A.

Inventor： Franck Roche ,  Pascal Narche ,  Ludovic Ruat

IPC: G06F009/00

CPC classification number: G06F11/2273 ,  G01R31/31701 ,  G01R31/31719

Abstract: A microprocessor includes a counter having a counting input and a reset input. The counting input is coupled to a first terminal of the microprocessor for the selection of an operating mode thereof by application of a predetermined number of pulses to the first terminal. The reset input of the counter is driven by a control signal present on a second terminal of the microprocessor. The control signal is maintained by default at a first logic value ensuring the maintaining at zero of the counter during the initialization period by a circuit internal or external the microprocessor. Immunity against electromagnetic perturbations causing the microprocessor to enter into the test mode is provided.

Abstract translation: 微处理器包括具有计数输入和复位输入的计数器。 计数输入耦合到微处理器的第一端，用于通过向第一终端施加预定数量的脉冲来选择其操作模式。 计数器的复位输入由存在于微处理器的第二端子上的控制信号驱动。 控制信号默认维持在第一逻辑值，确保在初始化期间通过内部或外部微处理器的电路将计数器保持在零。 提供了防止导致微处理器进入测试模式的电磁扰动的抗扰度。