Apparatus for controlling of data transportation and a method

摘要

For data transportation between a master apparatus 2 and at least one module 4 there is provided a clock signal and a strobe signal on clock lines 32 and 34 respectively. In Normal mode data from micro-controller 6 is written into output buffer block 16 and into output shift register block 18 by the strobe signal. The data is then shifted out serially bit by bit by the clock signal to input shift register block 30 of module 4 via output port 36. Data received into input shift register block 22 from module 4 via input port 38 is transferred to input buffer block 20 by the strobe signal. In SPI mode data is transferred between SPI devices 12 and 14 using the strobe signal, while the clock signal is deactivated or stopped. Thus data in the shift register blocks is halted until the normal mode is resumed. Typical applications include supervisory control and data acquisition (SCADA) systems.