| 摘要 |
The invention relates to a method for transmitting and storing system-related data such as, for example, balance data and sales data, from a microcomputer system which is used for controlling systems, to an external base memory located on a circuit board. The systems to be controlled are, for example, multi-storey carparks, petrol stations or other automatic sales and service points. To prevent wrong data inputs or outputs due to noise pulses and prevent manipulation, the random-access memory of the base memory is partially addressed via an I/O port of the microcomputer system before the transmission of the data. The remaining addressing is carried out by a timing section, which is also addressable via the I/O port and is located on the base memory. The active time of the timing section is checked by logical combination with the address line in a gate circuit. |
