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The AVR chips all have internal hardware that can be used. For this description of the hardware the 90S8515 was used. Newer chips like the Mega8515 may differ and have more or less internal hardware. You will need to read the manufacturers data sheet for the processor you are using to learn about the special internal hardware available. Timer / Counters The AT90S8515 provides two general purpose Timer/Counters – one 8-bit T/C and one 16-bit T/C. The Timer/Counters have individual pre-scaling selection from the same 10-bit pre-scaling timer. Both Timer/Counters can either be used as a timer with an internal clock time base or as a counter with an external pin connection which triggers the counting. timer-counter prescaler
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Minimum System ATMega 8535,16,32 Minimum system ATmega 8535/16/32 schematic circuit that is integrated with RS232 serial communication. Minimum System is a microcontroller circuit that used to work. This circuit usually consists of: 1. Crystal = to generate pulse 2. a series reset = to do the “Restart” work microcontroller Components that can be used as input and output such as: 1. display = LCD, dot matrix, seven segment, etc. 2. input = keypad, push button, etc. Schematics above are the minimum system that has been integrated with RS232 serial communication. with the RS232, then the minimum system is ready to be used to communicate between the microcontroller to the computer, or microcontroller to microcontroller.
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- avr atmega
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