proteus74ls191引脚图及功能表

Proteus74LS191是一种集成电路芯片，它是一种4位二进制同步上升计数器。下面是其引脚图及功能表：

引脚图：

             +--------+--+--------+
        CP   |1       |  |16      |  VCC
        A    |2       |  |15      |  RC
        B    |3       |  |14      |  QA
        C    |4  74LS191   13|  QB
        D    |5       |  |12      |  QC
        P    |6       |  |11      |  QD
        TC   |7       |  |10      |  MR
             +--+

功能表：

         +---+---+---+---++---+---+---+---+
         | C | B | A | D || QD| QC| QB| QA|
         +===+===+===+===++===+===+===+===+
         | X | X | X | X || 0 | 0 | 0 | 0 |
         +---+---+---+---++---+---+---+---+
         | 0 | 0 | 0 | 0 || 0 | 0 | 0 | 1 |
         +--++---+---+---+---+
         | 0 | 0 | 1 | 0 || 0 | 0 | 1 | 0 |
         +---+---+---+---++---+---+---+---+
         | 0 | 1 | 0 | 0 || 0 | 1 | 0 | 0 |
         +--+---+---+---+
         | 0 | 1 | 1 | 0 || 0 | 1 | 1 | 1 |
         +---+---+---+---++---+---+---+---+
         | 1 | 0 | 0 | 0 || 1 | 0 | 0 | 0 |
         +--+---+---+---++---------------+