| 摘要 |
PROBLEM TO BE SOLVED: To provide a self-test circuit that can ensure a CLK input and a test determination output even without an external input from a tester or without a result determination of a tester comparator, and can ensure a UART transmission/reception test. SOLUTION: A semiconductor integrated circuit incorporating a microcomputer comprises a jumper line 15 circulating in a chip, to which jumper line each port circuit is connected via a selector 14. In conformance to port circuits requiring a plurality of lines of input triggers, a plurality of jumper lines 15C and 15D are laid. The jumper lines 15, 15C and 15D are separate. The port circuits comprise a switchable input/output output driver 10 connected to an input data line 13, from which one lead is drawn. COPYRIGHT: (C)2004,JPO
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