Editing A Really Basic Guide to the PIC Microprocessor and BoostC

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I suppose an input/output port is a peripheral, but normally the term is used for something more complicated. A counter/timer is one example. A counter is connected to some source ( a pin for example ) and each time the pin changes from a 0 to a 1 the counter increase by 1. Some counters are 8 bit, some 16 bits( this is the number of bits for the highest number the counter can count to )..  
 
I suppose an input/output port is a peripheral, but normally the term is used for something more complicated. A counter/timer is one example. A counter is connected to some source ( a pin for example ) and each time the pin changes from a 0 to a 1 the counter increase by 1. Some counters are 8 bit, some 16 bits( this is the number of bits for the highest number the counter can count to )..  
  
Other peripherals are: PWM outputs ( pulse width modulation ) Serial communications, Analog to digital converters.
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Other peripherals are: PWM outputs ( pulse witdth modulation ) Serial communications, Analog to digital converters.
  
 
All the peripherals discussed so far are built right into the chip, they are called internal peripherals, peripherals can also be outside the PIC chip, these are external peripherals.  
 
All the peripherals discussed so far are built right into the chip, they are called internal peripherals, peripherals can also be outside the PIC chip, these are external peripherals.  

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