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16F628A Pin Out


14
 VDD Power Connection. Connect to +5V
5
 VSS Ground Connection
4
 RA5/MCLR/VPP Master Clear- Reset Pin.
  • Pin 4 can be set as RA5 Input or Master Clear with the configuration bit MCLRE.
  • In MCLR Mode, Logic 0 resets microcontroller.
  • In MCLR Mode, For proper operation connect this pin to 5V,
  • In MCLR Mode, NEVER keep this pin unconnected!
  • VPP is programming voltage input
16
 RA7/OSC1/CLKIN Oscillator Pin 1.
  • External clock source is connected here.
  • If a crystal is being used, one terminal of the crystal has to be connected to this pin, connect two 22 pF capacitors between the ground and crystal terminals
  • If internal oscillator is being used, pin 16 can be used as RA7.
  • If external clock source is being used, square wave must be feed from this pin
15
 RA6/OSC2/CLKOUT Oscillator Pin 2.
  • A square wave can be obtained here with 1/4 of the frequency supplied
  • If a crystal is being used, the other terminal of the crystal has to be connected to this pin
  • If internal oscillator is being used, pin 16 can be used as RA6 I/O.
17
 RA0/AN0 PORTA bit 0 or Analog comparator input
18
 RA1/AN1 PORTA bit 1 or Analog comparator input
1
 RA2/AN2/VREF PORTA bit 2 or Analog comparator input or VREF output
2
 RA3/AN3/CMP1 PORTA bit 3 or Analog comparator input or Comparator 1 output
3
 RA4/T0CKI/CMP2
  • RA4: PORTA bit 4
  • T0CKI: Timer 0 external clock source (In order to activate, set OPTION Register-Bit 5. Option Register-Bit 4 determines the edge type for each increment)
  • CMP2: Comparator 2 output
6
 RB0/INT
  • RB0: PORTB bit 0
  • INT: External Interrupt (In order to activate, set INTCON Register-Bit 7 and 4. Option Register-Bit 6 determines the edge type triggerring interrupt)
7
 RB1/RX/DT PORTB bit 1 or USART receive pin or Synchronous data I/O
8
 RB2/TX/CK PORTB bit 2 or USART transmit bit or Synchronous clock I/O
9
 RB3/CCP PORTB bit 3 or Capture/Compare/PWM I/O
10
 RB4/PGM PORTB bit 4 or Low voltage programming input pin
11
 RB5 PORTB bit 5
12
 RB6/T1OSO/T1CKI/PGC PORTB bit 6 or Timer 1 Oscillator Output or Timer 1 Clock Input or programming clock
13
 RB7/T1OSI/PGD PORTB bit 7 or Timer 1 Oscillator Input or ICSP data I/O