ATmega16HVB datasheet(93/273 Pages) ATMEL

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8042A–AVR–07/09

ATmega16HVB/32HVB

The following code examples show how to do an atomic write of the TCNTnH/L register con-

tents. Writing any of the OCRnA/B registers can be done by using the same principle.

Note:

See “About Code Examples” on page 8.

The assembly code example requires that the r17:r16 register pair contains the value to be writ-

ten to TCNTnH/L.

17.9.1

Reusing the temporary high byte register

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

TIMn_WriteTCNTn:

; Save global interrupt flag

r18,SREG

; Disable interrupts

cli

; Set TCNTn to r17:r16

out

TCNTnH,r17

out

TCNTnL,r16

; Restore global interrupt flag

out

SREG,r18

ret

C Code Example

void

TIMn_WriteTCNTn( unsigned int i )

{

unsigned char

sreg;

unsigned int

/* Save global interrupt flag */

sreg = SREG;

/* Disable interrupts */

_CLI();

/* Set TCNTn to i */

TCNTn = i;

/* Restore global interrupt flag */

SREG = sreg;

}

ATmega16HVB 数据表(PDF) 93 Page - ATMEL Corporation

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