ATMEGA16U4PRE datasheet(17/433 Pages) ATMEL

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ATMEGA16U4PRE Datasheet(PDF) 17 Page - ATMEL Corporation

Part #	ATMEGA16U4PRE

Description	Optional Boot Code Section with Independent Lock Bits

Download	433 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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17 / 433 page

7766E–AVR–04/10

ATmega16U4/ATmega32U4

4.8.1

Interrupt Response Time

The interrupt execution response for all the enabled AVR interrupts is five clock cycles minimum.

After five clock cycles the program vector address for the actual interrupt handling routine is exe-

cuted. During these five 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 exe-

cution response time is increased by five 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 five clock cycles. During these five clock cycles,

the Program Counter (three bytes) is popped back from the Stack, the Stack Pointer is incre-

mented by three, and the I-bit in SREG is set.

Assembly Code Example

sei

; set Global Interrupt Enable

sleep

; enter sleep, waiting for interrupt

; note: will enter sleep before any pending

; interrupt(s)

C Code Example

__enable_interrupt(); /* set Global Interrupt Enable */

__sleep(); /* enter sleep, waiting for interrupt */

/* note: will enter sleep before any pending interrupt(s) */

Manufacturer	Part #	Datasheet	Description
ATMEL Corporation	ATMEGA16U4	598Kb / 23P	8-bit Microcontroller with 16/32K Bytes of ISP Flash and USB Controller
	ATMEGA16U4	194Kb / 28P	USB DFU Bootloader
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	ATmega16U4	6Mb / 408P	8-bit Microcontroller with 16/32K Bytes of ISP Flash and USB Controller
	ATMEGA16U4	733Kb / 26P	8-bit Microcontroller with 16/32K Bytes of ISP Flash and USB Controller

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TT Electronics.	EN11	817Kb / 4P	2 bits gray code
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