| 摘要 |
PURPOSE:To make it possible to simplify a control circuit and make control diverse, by reading out the ROM matrix according to counting of control clocks to form a dispaly switching signal, a time correction signal, and so on. CONSTITUTION:Clocks applied to display switching and time correction input terminals SA and SB are counted by counters CA and CB formed by plural FFs respectively. Outputs of counters CA and CB and inversion outputs through an inverter access the memory part constituted by the ROM matrix to output a switching control signal or a time correction control signal from the ROM according to clocks applied to terminal SA or SB. This selective access state of the ROM is reset by applying a clock to forced reset input terminal SC. Since this control circuit is not constituted by individual logical elements, the control circuit is simplified and can correspond to diverse control, and the element arrangement determination time dependent upon mask layout for control circuit generation is shortened. |
