By Jan Axelson
ISBN-10: 096508194X
ISBN-13: 9780965081948
A hands-on creation to microcontroller undertaking layout with dozens of instance circuits and courses. provides sensible designs to be used in information loggers, controllers, and different small-computer applications.About The Microcontroller suggestion Book:Complete circuit schematics and components lists so that you can simply construct the circuits yourselfDesign concept - with find out how to extend or alter the circuits shownExample application listings - for handy trying out of the circuitsConstruction and debugging suggestions - that will help you get every little thing up and working with out problemsVendor listings - so that you can locate the parts and different goods you would like to your projectsAbout the 8052-BASICExample circuits and courses within the e-book are in line with the preferred 8052-BASIC microcontroller, whose on-chip uncomplicated programming language makes it effortless to put in writing, run, and try your courses. With over a hundred instructions, directions, and operators, the BASIC-52 interpreter can do even more than different single-chip fundamentals. Its skills comprise floating-point math, string dealing with, and certain instructions for storing courses in EPROM, EEPROM, or battery-backed RAM.You can use any laptop with a serial port as a bunch procedure for writing, importing, operating, debugging, and storing courses as you boost a venture. whilst venture improvement is entire, you could disconnect the host desktop, and the 8052-BASIC will run your software instantly on bootup. it's also possible to use an 8052-BASIC circuit as a improvement method for importing and debugging assembled or compiled courses. As a member of the 8051 microcontroller kinfolk, the 8052-BASIC makes use of a customary, populararchitecture.
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Additional resources for The Microcontroller Idea Book: Circuits, Programs and Applications Featuring the 8052-Basic Single-Chip Computer
Sample text
If EA is low, the 8052 ignores its internal ROM and instead accesses external program memory on boot-up. You can wire EA directly The Microcontroller Idea Book 25 Chapter 3 to +5V, or use a jumper as shown in the schematic, to allow you to bypass BASIC-52 and boot to an assembly-language program in external memory, as described in Chapter 13. The crystal. 0592-Mhz crystal that connects to pins 18 and 19 of U2. This crystal frequency has two advantages. 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.
Code memory can’t be written to. AD0-AD7 connect to U4, a 74HCT373 octal transparent latch that stores the lower address byte during memory accesses. The chip contains a set of D-type latches that store logic states. 26 The Microcontroller Idea Book Powering Up Figure 3-2. Truth tables for the 74HCT138 decoder and 74HCT373 octal transparent latch. A latch-enable input (LE) controls whether the outputs are latched (stored), or not latched (immediately follow the inputs). Figure 3-2 shows the truth table for the chip.
This location is used because BASIC-52’s programming commands assume that the nonvolatile memory begins at 8000h. OR gate U9A prevents the NVRAM or EEPROM from being accidentally overwritten during power-up. When the 8052-BASIC first powers up, its port pins are in an unknown state for a brief period, until the reset algorithm in the chip brings them all high. During this The Microcontroller Idea Book 51 Chapter 4 Table 4-1. Parts list for Figure 4-3. 1-microfarad ceramic disc Miscellaneous J4 SIP header, 3-terminal, and shorting block IC sockets time, there is a small chance that the right combination of outputs will cause a write operation to occur at U8.