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Additional info for Circuit Cellar (March 2002)
EXE) to download the object file to the emulator. Select either COM1 or COM2 with a command line option of -p1 or -p2. Any standard data rate (1200, 2400, 4800, 9600, 19,200, 28,800, or 57,600 bps) may be selected with the -r
The RS-232 handshake signals (at the PC connector) should be connected in a null modem configuration. The emulator PCB is double sided with platedthrough holes. IC sockets are used to simplify hardware debugging. So far, we skipped an integral part of the system, the power supply circuit. Versions one and two of the emulator may use 5-V power from the target board circuit. The third version requires a separate 15-V power supply. The current rating of this power supply is decided mainly by the reed relays.
The ’2051 has an 8051 core, UART, 15 I/O lines with 20 mA, and direct LED driving capability. This was perfect, it was as if it had been specially designed to solve our problem. Although we carried out the initial development without any specific hardware tool, eventually we realized we would need an in-circuit emulator for future applications; we were steadfast in our choice of the AT89Cx051 family. The do-it-yourself approach was irresistible. In this article, we will discuss how we developed an AT89Cx051 emulator and circuits.