Table 2. Microcontroller pin description[5]

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Presentation transcript:

Table 2. Microcontroller pin description[5] PIN NO. PIN NAME DESCRIPTION ALTERNATE FUNCTION 1 (XCK/T0) PBO I/O PORT B, Pin 0 T0: timer 0 external counter input. XCK: USART External Clock I/O 2 (T1) PB1 I/O PORT B, Pin 1 T1: Timer1 External Counter Input 3 (INT2/AINO) PB2 I/O PORT B, Pin 2 AINO: Analog Comparator Positive I/P INT2:External Interrupt2 Input 4 (OC0/AIN1) PB3 I/O PORT B, Pin 3 AIN1: Analog Comparator Negative I/P OC0: Timer0 Output Compare Match Output 5 (SS) PB4 I/O PORT B, Pin 4 In System Programmer(ISP) Serial Peripheral Interface(SPI) 6 (MOSI) PB5 I/O PORT B, Pin 5 7 (MISO) PB6 I/O PORT B, Pin 6 8 (SCK) PB7 I/O PORT B, Pin 7 9 RESET Reset Pin, Active Low Reset 10 Vcc Vcc=+5V 11 GND GROUND 12 XTAL2 Output to Inverting Oscillator Amplifier 13 XTAL1 Input to Inverting Oscillator Amplifier 14 (RXD) PDO I/O PORT D, Pin 0 USART Serial Communication Interface 15 (TXD) PD1 I/O PORT D, Pin 1 16 (INT0) PD2 I/O PORT D, Pin 2 External Interrupt INT0 17 (INT1) PD3 I/O PORT D, Pin 3 External Interrupt INT1 18 (OC1B) PD4 I/O PORT D, Pin 4 PWM Channel Outputs 19 (OC1A) PD5 I/O PORT D, Pin 5 20 (ICP) PD6 I/O PORT D, Pin 6 Timer/Counter 1 Input Capture Pin 21 PD7 (OC2) I/O PORT D, Pin 7 Timer/Counter 2 Output Compare Match Output 22 PC0 (SCL) I/O PORT C, Pin 0 TW1 Interface 23 PC1 (SDA) I/O PORT C, Pin 1 24 PC2 (TCK) I/O PORT C, Pin 2 JTAG Interface 25 PC3 (TMS) I/O PORT C, Pin 3 26 PC4 (TDO) I/O PORT C, Pin 4 27 PC5 (TDI) I/O PORT C, Pin 5 28 PC6 (TOSC1) I/O PORT C, Pin 6 Timer Oscillator Pin 1 29 PC7 (TOSC2) I/O PORT C, Pin 7 Timer Oscillator Pin 2 30 AVcc Voltage Supply = Vcc for ADC 31 32 AREF Analog Reference Pin for ADC 33 PA7 (ADC7) I/O PORTA, Pin 7 ADC Channel 7 34 PA6 (ADC6) I/O PORTA, Pin 6 ADC Channel 6 35 PA5 (ADC5) I/O PORTA, Pin 5 ADC Channel 5 36 PA4 (ADC4) I/O PORTA, Pin 4 ADC Channel 4 37 PA3 (ADC3) I/O PORTA, Pin 3 ADC Channel 3 38 PA2 (ADC2) I/O PORTA, Pin 2 ADC Channel 2 39 PA1 (ADC1) I/O PORTA, Pin 1 ADC Channel 1 40 PA0 (ADC0) I/O PORTA, Pin 0 ADC Channel 0 M. Ehikhamenle et al. Design and Development of a Smart Digital Tachometer Using At89c52 Microcontroller. American Journal of Electrical and Electronic Engineering, 2017, Vol. 5, No. 1, 1-9. doi:10.12691/ajeee-5-1-1 © The Author(s) 2015. Published by Science and Education Publishing.