| 摘要 |
PURPOSE:To simplify the constitution and to quicken the count operation by providing a count-up control gate means controlling the count-up value into 0, +1, +2 based on a two bits control signal. CONSTITUTION:The phase control counter 1 applies the phase control of a count output with three kinds of count up values of 0, +1, +2 depending on supplied two bits phase control signals B1, B2. With the phase control signals of B1=0, B2=0 for example, the most significant bit count signal MSB and the carry signal CRY are kept to the initial state and the count-up value is made substantially zero. With the relation of B1=1 and B2=0, the count-up value is to be +1 and the normal operation is executed. Moreover, in case of B1=0, B2=1, the count-up value is to be +2. Thus, the maximum gate stage number is 4 to attain high speed count and the constitution is made simple by reducing the number of transistors being components of the phase control counter. |
