ATmega16 datasheet(94/357 Pages) ATMEL

94 / 357 page

2466S–AVR–05/09

ATmega16(L)

The following code examples show how to do an atomic write of the TCNT1 Register contents.

Writing any of the OCR1A/B or ICR1 Registers can be done by using the same principle.

Note:

1. See “About Code Examples” on page 7.

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

ten to TCNT1.

Reusing the

Temporary High Byte

If writing to more than one 16-bit register where the High byte is the same for all registers writ-

ten, 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.

Timer/Counter

Clock Sources

The Timer/Counter can be clocked by an internal or an external clock source. The clock source

is selected by the Clock Select logic which is controlled by the Clock Select (CS12:0) bits

located in the Timer/Counter Control Register B (TCCR1B). For details on clock sources and

prescaler, see “Timer/Counter0 and Timer/Counter1 Prescalers” on page 87.

Assembly Code Example

(1)

TIM16_WriteTCNT1:

; Save global interrupt flag

r18,SREG

; Disable interrupts

cli

; Set TCNT1 to r17:r16

out

TCNT1H,r17

out

TCNT1L,r16

; Restore global interrupt flag

out

SREG,r18

ret

C Code Example(1)

void

TIM16_WriteTCNT1 ( unsigned int i )

{

unsigned char

sreg;

unsigned int

/* Save global interrupt flag */

sreg = SREG;

/* Disable interrupts */

_CLI();

/* Set TCNT1 to i */

TCNT1 = i;

/* Restore global interrupt flag */

SREG = sreg;

}

ATmega16 데이터시트(PDF) 94 Page - ATMEL Corporation

ATmega16 데이터시트(HTML) 94 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

데이터시트 다운로드

링크 URL