Abstract: A program-controlled unit has a memory for storing data and a memory protection device for protecting the memory from read-access operations initiated by non-authorized personnel. The program-controlled unit can be configured in such a way that it automatically activates the read protection if required and that the read protection can be adapted to given conditions by authorized personnel.

Abstract: A program-controlled unit has a memory for storing data and a memory protection device for protecting the memory from read and/or write accesses by people not authorized for access. The described program-controlled unit enables the user of the program-controlled unit to determine whether and if so for what parts of the memory a read protection and/or a write protection shall be effective.

Abstract: A program-controlled unit has a memory for storing data and a memory protection device for protecting the memory from read- and/or write-access operations initiated by non-authorized personnel. The memory protection device signals a protection violation, when non-authorized personnel attempt a read-access of the memory when the read protection is active and/or when non-authorized personnel attempt a write access of the memory when the write protection is active and/or when non-authorized personnel attempt to deactivate or reconfigure the read- or write-access by accessing the memory protection device.

Abstract: A program-controlled unit has a non-volatile memory that can be repeatedly reprogrammed, for storing data. The program-controlled unit contains a memory protection device, which ensures that the contents of the memory, or a specific part of the latter can no longer be modified.

Abstract: A Dynamic Memory Access (DMA) control device for transmitting data between a data transmitter and a data receiver via an external bus formed of a data bus, an address bus and a control bus, and has a multiplicity of data transmitters/receivers and at least one microprocessor connected thereto. The transmission of the data in the external bus depends upon a channel program containing channel transfer commands and channel control commands, and includes a central control unit for addressing, dependent upon a channel command, a microcommand, address and control signals corresponding to the microcommand on an internal address-control bus; an address unit is connected to the internal address/control bus and to an internal data bus wherein addresses of a data transmitter, data receiver and the channel program are stored.

Abstract: The data transmitter is formed as a memory connected to the bus for storing a channel program containing transfer commands. The control device includes a comparison device and first and second registers connected to the comparison device having mutually correlated register positions marking termination causes. The control device controls the data transfer between the data transmitter and data receiver as a function of the channel program stored in the memory.