KR930011473A - Asynchronous Serial Data Receiving Method of Mobile Phone - Google Patents

Abstract

A method for receiving asynchronous serial data in a mobile communication telephone, and in particular, a telephone number direct selection device for outputting asynchronous serial data of a telephone number corresponding to input of key data, and data output from the telephone number direct selection device. The present invention relates to a mobile device serial data receiving method of a mobile communication telephone having a cellular mobile communication telephone.

The operation according to the present invention detects the start bit of the asynchronous serial data format in 1 / n periods of the transmission data bit period in order to correctly receive the transmission data output from the telephone number direct selection device. The data bit and stop bit states received after the detection is detected twice are detected in the bit period of the transmission data to receive the serial data string.

The mobile telephone can be configured more simply by receiving serial data from the outside in the above operation procedure.

Description

Asynchronous Serial Data Receiving Method of Mobile Phone

Since this is an open matter, no full text was included.

3 is a connection diagram of a mobile communication telephone and a serial data transmitter according to the present invention.

4 is asynchronous serial data format diagram.

5a and 5b show a serial data reception flow diagram in accordance with the present invention.

Claims (7)

Asynchronous serial of a mobile telephone having a telephone number direct selection device for outputting asynchronous serial data of a telephone number corresponding to input of key data, and a cellular mobile telephone receiving data output from the telephone number direct selection device. A data receiving method, comprising: a first step of detecting a start bit of an asynchronous serial data format in 1 / n periods of the transmission data bit period in order to correctly receive transmission data output from the telephone number direct selection device; And a second step of detecting a data bit and a stop bit state received after the detection of the start bit by one step in the bit period of the transmission data and receiving a serial data string. The method of claim 1, wherein after performing the second process, the first process and the second process are repeated at least three times to receive three asynchronous serial data strings and store the three asynchronous serial data strings in an internal memory. And comparing the data strings to determine correct received data only if the two received data strings are the same. The method of claim 1 or 2, wherein n in the 1 / n period of the second process is a natural number of two or more. An asynchronous mobile telephone having a telephone number direct selection device for outputting asynchronous serial data of a telephone number corresponding to input of key data, and a cellular mobile telephone for receiving data output from the telephone number direct selection device. A serial data receiving method comprising: a first step of searching whether a flag is set during a DTS processing when a timer interrupt occurs; and a step of searching for whether the DTS processing has ended when it is determined that a flag is set during a DTS processing in the first step; A second process of resuming the first process and searching whether the current received bit is a start bit when not finished; and after a predetermined first time delay when determining that the current received bit is not a bit as a result of the search of the second process Return to step 1 and set the flag during DTS processing set in the internal memory when judged to be the start bit. A third step of setting a timer interrupt for a second period, a fourth step of incrementing a DTS data bit counter and determining a value of the DTS data bit counter when it is determined that a flag is set during DTS processing in the first step; In the fourth process, when it is determined that the value of the DTS data bit counter is not "9", the logic state of 1 bit is searched to determine a 1-bit value, and when it is determined that the value is "9", a timer interrupt is generated. After the fifth process and the fifth process is performed, it is checked whether the current input bit is a stop bit and returns to the first process if it is not a stop bit. If the stop bit is a stop bit, the received data stream is stored in the internal memory and the DTS process is performed. And a sixth step of clearing the completion flag and clearing the data bit counter during the DTS processing. 5. The method of claim 4, wherein the third process comprises: a reception bit state searching process of returning to the first process after a predetermined first time delay when the current reception bit is not a start bit; A double check count is incremented when the search result is determined to be a start bit, and a double check process is performed to search whether the start bit is detected at least twice; and when the search result start bit of the double check process is not detected twice, the first check bit is detected. And returning to the process, and setting the flag during the DTS processing and changing and setting the timer interrupt to the second period when determining that the detection is performed twice. The method of claim 5, wherein the sixth process checks whether the current input bit is a stop bit and returns to the first process if it is not a stop bit, and if it is a stop bit, shifts a 3-byte data buffer to store a new data string in the buffer. A data string receiving process for increasing the data string count and determining whether the value is " 3 ", and a DTS data bit counter indicating that the data string receiving state is three times or less in the receiving state searching process. And resetting the flag during the DTS processing and returning to the first process, and when it is determined three times, sets the DTS processing complete sound tones, the flag during the DTS processing, and the flag initialization process to clear the DTS data bits. . 7. A method according to any one of claims 4 to 6, wherein the first period of the timer interrupt is 1 / N of the received data bit period and the second period is the received data bit period. ※ Note: The disclosure is based on the initial application.