| 摘要 |
PURPOSE:To synthesize a multi-value picture data at high speed by providing an arithmetic function to a storage circuit and carrying out the read-out and arithmetic in the storage circuit with a single access. CONSTITUTION:The read data DO and the external data DI undergo the arithmetic through a control circuit 1 with indications of the external control signals CNT and Cr. While the write data Z of the arithmetic result is written to a storage element 2. When both signals CNT and Cr are equal to 0, such a mode is set that the data DI serves as a control signal which decides whether the data DO of the element 2 is transmitted as it is or inverted. While a mode where the data DI is transmitted as it is is secured when the signals CNT and Cr are equal to 0 and 1 respectively. When the signal CNT is equal to 1, the data DO, the data DI and the signal Cr are added together.
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