AT90PWM3 datasheet(106/361 Pages) ATMEL

106 / 361 page

106

4317J–AVR–08/10

AT90PWM2/3/2B/3B

The following code examples show how to do an atomic read of the TCNTn Register contents.

Reading any of the OCRnx or ICRn Registers can be done by using the same principle.

Note:

1. The example code assumes that the part specific header file is included.

For I/O Registers located in extended I/O map, “IN”, “OUT”, “SBIS”, “SBIC”, “CBI”, and “SBI”

instructions must be replaced with instructions that allow access to extended I/O. Typically

“LDS” and “STS” combined with “SBRS”, “SBRC”, “SBR”, and “CBR”.

The assembly code example returns the TCNTn value in the r17:r16 register pair.

TABLE 4.

Assembly Code Example(1)

TIM16_ReadTCNT

; Save global interrupt flag

r18,SREG

; Disable interrupts

cli

; Read TCNT

n into r17:r16

r16,TCNT

r17,TCNT

; Restore global interrupt flag

out

SREG,r18

ret

C Code Example

(1)

unsigned int

TIM16_ReadTCNT

n( void )

{

unsigned char

sreg;

unsigned int

/* Save global interrupt flag */

sreg = SREG;

/* Disable interrupts */

_CLI();

/* Read TCNT

n into i */

i = TCNT

/* Restore global interrupt flag */

SREG = sreg;

return

}

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