| 摘要 |
<p>PURPOSE:To allow a required voltage level to cope with increase/decrease in number of output buffers flexibly by selecting supply or interruption of power supply to/from the output buffers depending on the shape of a mask pattern in the wiring process in the stage of manufacture of a microcomputer. CONSTITUTION:In selecting a switch S3 to be opened and other switches S1, S2, S4-Sn+1 to be conducted, a power supply fed to output buffers B1, B2 is given from a 1st power terminal V1 and the power supply fed to the output buffers B3-Bn is fed from a 2nd power terminal V2 by the mask pattern shape in the wiring stage. Only one among the switches S1-Sn+1 is unconducted by the shape of mask pattern. Thus, the number of output buffers connected to the power terminal V1 is selected optionally from zero to n-set.</p> |
