May 2024
Intermediate to advanced
534 pages
17h 58m
English
book
8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
by Subrata Ghoshal
Content preview from 8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
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26.2.2 | Pins and Signals
Fig. 26.1 shows all signals against their respective pin numbers for a 28-pin PDIP of ATmega8. Note that all
23 I/O lines have alternative functions. Only fi ve input lines, reserved for power supply, are not assigned any
alternative functions.
26.2 | AVR MICROCONTROLLERS
Observe that this 28-pin device (ATmega8) off ers more features than a standard 40-pin
8051.
26.2.3 | External Reset and Crystal Inputs (Optional)
An initial observation of Fig. 26.1 would reveal that even the system reset input or external crystal inputs
are optional. is is because the device contains a built-in RC oscillator circuit capable of ...
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