Abstract: The invention provides a processing system, comprising a memory comprising a processor call stack; a stack space usage register configured to determine the stack space usage of the processor call stack and to store a usage parameter indicative of the determined stack space usage; a first threshold register configured to store a pre-determinable first stack level threshold; and a first comparator configured to compare the usage parameter with the first stack level threshold and to output a first interrupt blocking signal, if the usage parameter exceeds the first stack level threshold, the first interrupt blocking signal being configured to block the decoding of interrupt signals input to the processing system and having interrupt priorities lower than or equal to or just lower than a first interrupt priority threshold. The invention further provides a method for stack management, especially in a processing system.

Abstract: The invention provides a processing system, comprising a memory comprising a processor call stack; a stack space usage register configured to determine the stack space usage of the processor call stack and to store a usage parameter indicative of the determined stack space usage; a first threshold register configured to store a pre-determinable first stack level threshold; and a first comparator configured to compare the usage parameter with the first stack level threshold and to output a first interrupt blocking signal, if the usage parameter exceeds the first stack level threshold, the first interrupt blocking signal being configured to block the decoding of interrupt signals input to the processing system and having interrupt priorities lower than or equal to or just lower than a first interrupt priority threshold. The invention further provides a method for stack management, especially in a processing system.

Abstract: A signalling circuit for a signal channel of a communication network comprises a communication network terminal connectable to the signal channel and to a voltage supply; an input terminal connectable to receive a transmit signal; a driver device comprising a first driver terminal connected to the communication network terminal, a second driver terminal connected to ground, and a driver control terminal connected to the input terminal; wherein the driver device is arranged to connect the communication network terminal to ground in response to a transition from a low to a high voltage driver control signal state of a driver control signal received at the driver control terminal.

Abstract: A signalling circuit for a signal channel of a communication network comprises a communication network terminal connectable to the signal channel and to a voltage supply; an input terminal connectable to receive a transmit signal; a driver device comprising a first driver terminal connected to the communication network terminal, a second driver terminal connected to ground, and a driver control terminal connected to the input terminal; wherein the driver device is arranged to connect the communication network terminal to ground in response to a transition from a low to a high voltage driver control signal state of a driver control signal received at the driver control terminal.