By Jan Axelson
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Extra info for The Microcontroller Idea Book Circuits, Programs, Applications featuring the 8052-BASIC Microcontroller Jan Axelson
When the programming command executes, pins 20, 22, and 27 should toggle, along with the address and data lines. Running a Stored Program When you have a program saved, you can run it from the NV memory. BASIC-52’s RAM and ROM commands switch from RAM mode, where BASIC-52 runs the program stored in RAM (U7), to ROM mode, where it looks in U8 for programs to run. When you’ve programmed successfully, run your program by typing ROM RUN or RROM You can store multiple programs, space permitting, and run each by specifying its number.
It gives accurate baud rates for serial communications, due to the way that the 8052’s timer divides the system clock to generate the baud rates. Plus, BASIC-52 assumes this frequency when it times the real-time clock, EPROM programming pulses, and serial printer port. 5 to 12 Megahertz. If you use a different value, you can use BASIC-52’s XTAL operator to adjust the timing to match the frequency of the crystal you are using. The serial communications are reliable if the baud rate is accurate to within a few percent.
Getting the system to boot up the first time can be the most challenging part of a project, especially when serial communications are involved. Here are some things that may help you isolate the cause of the problem: • Try again by pressing and releasing S1 and pressing the space bar. If you are using a 32K RAM for U7, BASIC-52 requires about 1 second to perform its memory check after a reset, before it will respond to the space bar. With an 8K RAM, the delay is a few tenths of a second (proportionately longer with slower crystals).