AT MEGA 32 IC

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index ATmega32-Pin-Diagram

ATmega32 is very much similar to ATmega16 microcontroller with certain differences which are discussed below. ATmega32 is an 8-bit high performance microcontroller of Atmel’s Mega AVR family. Atmega32 is based on enhanced RISC (Reduced Instruction Set Computing) architecture with 131 powerful instructions. Most of the instructions execute in one machine cycle. Atmega32 can work on a maximum frequency of 16MHz.
The differences between ATmega32 and ATmega16 can be summarized as follows:

  1. ATmega32 has 32 KB programmable flash memory, static RAM of 2 KB and EEPROM of 1 KB. The endurance cycle of flash memory and EEPROM is 10,000 and 100,000, respectively.

 

  ATmega32 ATmega16
RAM 2 KB 1 KB
Flash 32 KB 16 KB
EEPROM 1 KB 512 bytes

 

  1. The Bootloader area, the NRWW section starts at word 0x3800 in ATmega32 while in ATmega16 it starts at 0x1C00.
  2. ATmega32 has a different interrupt table, the table given below shows the difference. More details can be obtained from the respective datasheets.

 

Vector # ATmega32 ATmega16
1 Reset Reset
2 INT0 INT0
3 INT1 INT1
4 INT2 Timer2 COMP
5 Timer2 COMP Timer2 OVF
6 Timer2 OVF Timer1 CAPT
7 Timer1 CAPT Timer1 COMPA
8 Timer1 COMPA Timer1 COMPB
9 Timer1 COMPB Timer1 OVF
10 Timer1 OVF Timer0 OVF
11 Timer0 COMP SPI, STC
12 Timer0 OVF USART, RXC
13 SPI, STC USART, UDRE
14 USART, RXC USART, TXC
15 USART, UDRE ADC
16 USART, TXC EE_RDY
17 ADC ANA_COMP
18 EE_RDY TWI
19 ANA_COMP INT2
20 TWI Timer0 COMP
21 SPM_RDY SPM_RDY

 

  1. In MCUCR register, the SM2 and SE bits are swapped, i.e., the SM2 bit is bit7 and SE bit is bit6 in MCUCR register in ATmega32.

 

Pin Description: 

 

Pin No. Pin name Description Alternate Function
1 (XCK/T0) PB0 I/O PORTB, Pin 0 T0: Timer0 External Counter Input.XCK : USART External Clock I/O
2 (T1) PB1 I/O PORTB, Pin 1 T1:Timer1 External Counter Input
3 (INT2/AIN0) PB2 I/O PORTB, Pin 2 AIN0: Analog Comparator Positive I/PINT2: External Interrupt 2 Input
4 (OC0/AIN1) PB3 I/O PORTB, Pin 3 AIN1: Analog Comparator Negative I/POC0 : Timer0 Output Compare Match Output
5 (SS) PB4 I/O PORTB, Pin 4 In System Programmer (ISP)Serial Peripheral Interface (SPI)
6 (MOSI) PB5 I/O PORTB, Pin 5
7 (MISO) PB6 I/O PORTB, Pin 6
8 (SCK) PB7 I/O PORTB, 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) PD0 I/O PORTD, Pin 0 USART Serial Communication Interface
15 (TXD) PD1 I/O PORTD, Pin 1
16 (INT0) PD2 I/O PORTD, Pin 2 External Interrupt INT0
17 (INT1) PD3 I/O PORTD, Pin 3 External Interrupt INT1
18 (OC1B) PD4 I/O PORTD, Pin 4 PWM Channel Outputs
19 (OC1A) PD5 I/O PORTD, Pin 5
20 (ICP) PD6 I/O PORTD, Pin 6 Timer/Counter1 Input Capture Pin
21 PD7 (OC2) I/O PORTD, Pin 7 Timer/Counter2 Output Compare Match Output
22 PC0 (SCL) I/O PORTC, Pin 0 TWI Interface
23 PC1 (SDA) I/O PORTC, Pin 1
24 PC2 (TCK) I/O PORTC, Pin 2 JTAG Interface
25 PC3 (TMS) I/O PORTC, Pin 3
26 PC4 (TDO) I/O PORTC, Pin 4
27 PC5 (TDI) I/O PORTC, Pin 5
28 PC6 (TOSC1) I/O PORTC, Pin 6 Timer Oscillator Pin 1
29 PC7 (TOSC2) I/O PORTC, Pin 7 Timer Oscillator Pin 2
30 AVcc Voltage Supply = Vcc for ADC
31 GND GROUND
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

 

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