| 摘要 |
PURPOSE:To enable a data bit to be effectively extracted, by a method wherein an initial '1' bit is detected by successively reading bits of series read data from a plurality of '0' bits arrangement side by a buffer means, and a table is referred by reading a specific number of bits as an address from the next right-hand bit of said '1' bit. CONSTITUTION:At first, a pointer register N is made 1. 1 bit data is taken out from the Nth bit enumerated after the last bit of received data stored in a buffer of 4 bytes. Whether said data is '0' or '1' is determined. In the case of '0', the point register N is joined by 1 to return to the original state. The processing is repeated until the initial '1' bit (boundary bit) enumerated after the last of buffers of received data (read data) is detected. When '1' is detected, 4 bit data of the N+1-N+4th after the last of the received data are taken out and inputted to a F1 register. Then, content of F2 is taken out by referring to a table 22 in ROM by a value of the F1 register, and data of D14-D1 are successively taken out from those of (the N+F2+1)th after the data to complete effective fetch process of the received data. |
