| 摘要 |
The receiver accepts frames which comprise standard characters and break characters longer than the standard character. The receiver includes two detectors for the two character types, the standard detector being controlled by the overlength break character detector. The asynchronous frame receiver (UART1) is configured to receive frames which comprise standard characters and, within the header, a break character which is longer than the standard character. The receiver includes a break character detection element (SM1) and a standard character detection element (SM2). The standard character processing element (SM2) is distinct from the break character detection element (SM1) and is activated by the break character detection element when this itself is active. A selection device is provides so that the circuit can operate in two modes, in the first of which the break character detection element is de-activated. In the second mode the break character detection element is activated and thus controlling the standard character detection element. |
