ATmega162 datasheet(111/324 Pages) ATMEL

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2513K–AVR–07/09

ATmega162/V

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

Writing any of the OCRnA/B 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 requires that the r17:r16 register pair contains the value to be writ-

ten to TCNTn.

Reusing the

Temporary High Byte

If writing to more than one 16-bit register where the high byte is the same for all registers written,

then the high byte only needs to be written once. However, note that the same rule of atomic

operation described previously also applies in this case.

Assembly Code Example(1)

TIM16_WriteTCNT

; Save Global Inter?upt Flag

r18,SREG

; Disable interrupt?

cli

; Set TCNT

n to r17:r16

out

TCNT

nH,r17

out

TCNT

nL,r16

; Restore Global In?errupt Flag

out

SREG,r18

ret

C Code Example

(1)

void

TIM16_WriteTCNT

n( unsigned int i )

{

unsigned char

sreg;

unsigned int

/* Save Global Inte?rupt Flag */

sreg = SREG;

/* Disable interrup?s */

_CLI();

/* Set TCNT

n to i */

TCNT

n = i;

/* Restore Global I?terrupt Flag */

SREG = sreg;

}

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