Patent ID: 8872834

Claim:
An electronic payment unit comprising: a display having first and second terminals for receiving display data; a first processor connected to the first terminal by a parallel link and adapted to provide display data to the first terminal at a first rate; and a second processor connected to the second terminal by a serial link and adapted to provide display data to the second terminal at a second rate lower than the first rate and adapted to provide the display with a signal of selection of the display data received on one of the first or second terminals, the second processor being further connected to the first processor and being adapted to provide the first processor with a signal for allowing or forbidding the transmission of display data to the display, wherein the second processor is adapted to transmit a signal to the first processor allowing the first processor to provide display data to the display when the second processor provides the display with a signal instructing the display to display the display data received on the first terminal, and wherein the second processor provides the first processor with a signal notifying the first processor not to transmit display data to the display when the second processor transmits to the display a signal instructing the display to display the display data received on the second terminal.