Circuit for generating a sampling signal for a UART interface, and by comparing values stored in peripheral clock memory

A circuit for generating a sampling signal for a UART interface, the circuit comprising:

• an input terminal designed to receive a peripheral clock;
• an output terminal designed to output the sampling signal;
• a bit rate memory designed to store a value corresponding to a desired bit rate of the UART interface;
• a peripheral clock memory designed to store a value corresponding to a frequency of the peripheral clock;
• a sum memory designed to store a sum value;
• and
• a computing unit designed to:
• compare a comparison value, which is dependent on the sum value stored in the sum memory, with a threshold value, which is dependent on the value stored in the peripheral clock memory,
• take the result of the comparison as a basis for generating the sampling signal at a first level or a second level, and
• in step with the peripheral clock and on the basis of the result of the comparison, either alter the sum value stored in the sum memory by the value stored in the bit rate memory or alter the sum value stored in the sum memory by a value that is dependent on the value stored in the peripheral clock memory;
• a summator designed to sum the sum value stored in the sum memory and the value stored in the bit rate memory in order to output the sum at its output terminal as the comparison value;
• a subtractor designed to form a difference between the value stored in the peripheral clock memory and the sum output by the summator and to output the difference at its output terminal;
• a comparator designed to compare the value stored in the peripheral clock memory with the comparison value and to take the result of the comparing as a basis for generating the sampling signal at the first level or the second level at its output terminal;
• and
• a multiplexer that has its control input connected to the output terminal of the comparator, that has its first input connected to the output terminal of the subtractor, that has its second input connected to the output terminal of the summator and that takes a state of the sampling signal output by the comparator as a basis for outputting either the signal present at its first input or the signal present at its second input at its output terminal,
• wherein the sum memory is in the form of a clock controlled register, wherein a clock input of the register has the peripheral clock applied to it and an input terminal of the register is connected to the output terminal of the multiplexer.