| 摘要 |
PURPOSE:To obtain an integrated circuit capable of efficiently performing program debugging by connecting an in-circuit emulator which accesses from an external microprocessor for emulator to an incorporated peripheral circuit. CONSTITUTION:To the integrated circuit 1, the microprocessor (CPU)17, a RAM19, and a ROM21 are connected through a bus 15 as external circuits. As a result, the microcomputer chip of the integrated circuit 1 constitutes a microcomputer system with those RAM19, and the ROM21, and a CPU3 can access freely to a VDP5, a PP17, a PSG9, the RAM19, and the ROM21. Also, the external CPU17 can access to each of the 5, the 7, the 9, the 19, and the 21, but, the selection of control by the CPU3, or the CPU17 is performed by a control signal from a selection terminal 13. |
