ATmega32U2 datasheet(14/314 Pages) ATMEL

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ATmega32U2 Datasheet(PDF) 14 Page - ATMEL Corporation

Part #	ATmega32U2

Description	8-bit Microcontroller with 8/16/32K Bytes of ISP Flash and USB Controller

PDF	314 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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14 / 314 page

7799B–AVR–07/09

ATmega8U2/16U2/32U2

CLI instruction. The following example shows how this can be used to avoid interrupts during the

timed EEPROM write sequence..

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.

Assembly Code Example

r16, SREG

; store SREG value

cli

; disable interrupts during timed sequence

sbi EECR, EEMPE

; start EEPROM write

sbi EECR, EEPE

out SREG, r16

; restore SREG value (I-bit)

C Code Example

char cSREG;

cSREG = SREG; /* store SREG value */

/* disable interrupts during timed sequence */

__disable_interrupt();

EECR |= (1<<EEMPE); /* start EEPROM write */

EECR |= (1<<EEPE);

SREG = cSREG; /* restore SREG value (I-bit) */

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