CPU
CPUCPU core
Each block of the PIC16F871: what it is, the registers that control it and the pins it uses.
CPU core
I/O port A
I/O port B
I/O port C
I/O port D
I/O port E
Analog-to-digital converter
Capture/compare/PWM 1
USART
Interrupts
Data EEPROM and flash program memory
Oscillator, power control and watchdog
Timer0
Timer1
Timer2