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US 7,120,831 B2Granted
In-circuit emulator system with changeable clock frequency
AssigneesRenesas Technology Corp., Mitsubishi Electric Semiconductor Application Engineering Corporation
InventorChikao Uchino
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Abstract
In an in-circuit emulator system, an in-circuit emulator debugger operated on a personal computer requests operation clock frequency, and transmits data for clock frequency designated by a user to an in-circuit emulator. The in-circuit emulator stores the received clock frequency data in a frequency data register. A PLL synthesizer oscillates with frequency based on the clock frequency data stored in the frequency data register to generate a clock.
Claims4
An in-circuit emulator system comprising:
- an in-circuit emulator installed into a target system in order to debug hardware of the target system mounting on a microcomputer and software that operates the microcomputer;
- in place of the microcomputer of the target system,
- a personal computer connected to the in-circuit emulator through a communication interface cable;
- and
- an in-circuit emulator debugger that is operated on the personal computer to control the in-circuit emulator, wherein
- the in-circuit emulator includes
- a frequency data register that stores clock frequency data set by the in-circuit emulator debugger;
- a phase locked loop synthesizer that generates a clock based on the clock frequency data stored in the frequency data register;
- and
- a microcomputer that executes the software and a control program of the in-circuit emulator in place of the microcomputer to be mounted on the target system operated by the generated clock.
7 more elements
Dependencies are inferred from the claim text.