Nordic Semiconductor ASA
Integrated circuit inputs and outputs

Abstract:

An integrated circuit microprocessor device comprises a central processing unit (CPU) and a general purpose input or output subsystem (2) having at least one external connection (4). The external connection is configured to provide an input to or output from the device depending upon an associated setting in the general purpose input or output subsystem. At least one further module on the device is configured to be able to request at least a first or a second task which may control a state of the external connection, the general purpose input or output subsystem being configured, upon receipt of conflicting requests for the first and second tasks, to apply a predetermined priority to allow only one of the tasks to be applied to the external connection.