A000003 Arduino, A000003 Datasheet - Page 15
A000003
Manufacturer Part Number
A000003
Description
MCU, MPU & DSP Development Tools MINI
Manufacturer
Arduino
Series
-r
Type
MCUr
Specifications of A000003
Processor To Be Evaluated
Atmega328
Processor Series
ATmega
Data Bus Width
8 bit
Interface Type
USB, RS-232
Operating Supply Voltage
7 V to 9 V
Contents
Board
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With/related Products
ATmega168
- Current page: 15 of 378
- Download datasheet (8Mb)
6.8.1
2545S–AVR–07/10
Interrupt Response Time
When using the SEI instruction to enable interrupts, the instruction following SEI will be exe-
cuted before any pending interrupts, as shown in this example.
The interrupt execution response for all the enabled AVR interrupts is four clock cycles mini-
mum. After four clock cycles the program vector address for the actual interrupt handling routine
is executed. During this four clock cycle period, the Program Counter is pushed onto the Stack.
The vector is normally a jump to the interrupt routine, and this jump takes three clock cycles. If
an interrupt occurs during execution of a multi-cycle instruction, this instruction is completed
before the interrupt is served. If an interrupt occurs when the MCU is in sleep mode, the interrupt
execution response time is increased by four clock cycles. This increase comes in addition to the
start-up time from the selected sleep mode.
A return from an interrupt handling routine takes four clock cycles. During these four clock
cycles, the Program Counter (two bytes) is popped back from the Stack, the Stack Pointer is
incremented by two, and the I-bit in SREG is set.
Assembly Code Example
C Code Example
Assembly Code Example
C Code Example
in r16, SREG
cli
sbi EECR, EEMPE
sbi EECR, EEPE
out SREG, r16
char cSREG;
cSREG = SREG; /* store SREG value */
/* disable interrupts during timed sequence */
_CLI();
EECR |= (1<<EEMPE); /* start EEPROM write */
EECR |= (1<<EEPE);
SREG = cSREG; /* restore SREG value (I-bit) */
sei
sleep; enter sleep, waiting for interrupt
; note: will enter sleep before any pending interrupt(s)
__enable_interrupt(); /* set Global Interrupt Enable */
__sleep(); /* enter sleep, waiting for interrupt */
/* note: will enter sleep before any pending interrupt(s) */
; set Global Interrupt Enable
; disable interrupts during timed sequence
; store SREG value
; start EEPROM write
; restore SREG value (I-bit)
ATmega48/88/168
15
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