ATmega32A Atmel Corporation, ATmega32A Datasheet - Page 71

• Manufacturer Part Number: ATmega32A
• Manufacturer: Atmel Corporation

Specifications of ATmega32A

• Flash (kbytes): 32 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 32
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

13.1.3
13.1.4
8155C–AVR–02/11
GICR – General Interrupt Control Register
GIFR – General Interrupt Flag Register
the ISC2 bit can be changed. Finally, the INT2 Interrupt Flag should be cleared by writing a logi-
cal one to its Interrupt Flag bit (INTF2) in the GIFR Register before the interrupt is re-enabled.
Table 13-3.
• Bit 7 – INT1: External Interrupt Request 1 Enable
When the INT1 bit is set (one) and the I-bit in the Status Register (SREG) is set (one), the exter-
nal pin interrupt is enabled. The Interrupt Sense Control1 bits 1/0 (ISC11 and ISC10) in the MCU
General Control Register (MCUCR) define whether the External Interrupt is activated on rising
and/or falling edge of the INT1 pin or level sensed. Activity on the pin will cause an interrupt
request even if INT1 is configured as an output. The corresponding interrupt of External Interrupt
Request 1 is executed from the INT1 interrupt Vector.
• Bit 6 – INT0: External Interrupt Request 0 Enable
When the INT0 bit is set (one) and the I-bit in the Status Register (SREG) is set (one), the exter-
nal pin interrupt is enabled. The Interrupt Sense Control0 bits 1/0 (ISC01 and ISC00) in the MCU
General Control Register (MCUCR) define whether the External Interrupt is activated on rising
and/or falling edge of the INT0 pin or level sensed. Activity on the pin will cause an interrupt
request even if INT0 is configured as an output. The corresponding interrupt of External Interrupt
Request 0 is executed from the INT0 interrupt vector.
• Bit 5 – INT2: External Interrupt Request 2 Enable
When the INT2 bit is set (one) and the I-bit in the Status Register (SREG) is set (one), the exter-
nal pin interrupt is enabled. The Interrupt Sense Control2 bit (ISC2) in the MCU Control and
Status Register (MCUCSR) defines whether the External Interrupt is activated on rising or falling
edge of the INT2 pin. Activity on the pin will cause an interrupt request even if INT2 is configured
as an output. The corresponding interrupt of External Interrupt Request 2 is executed from the
INT2 Interrupt Vector.
• Bit 7 – INTF1: External Interrupt Flag 1
When an edge or logic change on the INT1 pin triggers an interrupt request, INTF1 becomes set
(one). If the I-bit in SREG and the INT1 bit in GICR are set (one), the MCU will jump to the corre-
sponding Interrupt Vector. The flag is cleared when the interrupt routine is executed.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Symbol
t
INT
Parameter
Minimum pulse width for asynchronous
external interrupt
Asynchronous External Interrupt Characteristics
INTF1
INT1
R/W
R/W
7
0
7
0
INTF0
INT0
R/W
R/W
6
0
6
0
INTF2
INT2
R/W
R/W
5
0
5
0
R
R
4
–
0
4
–
0
Condition
R
R
3
–
0
3
–
0
R
2
–
0
2
–
R
0
Min
IVSEL
R/W
R
1
0
1
–
0
ATmega32A
Typ
50
IVCE
R/W
R
Max
0
0
0
–
0
Units
GICR
GIFR
ns
71