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ATMEGA32-16AC Datasheet(PDF) 91 Page - ATMEL Corporation

No. de pieza ATMEGA32-16AC
Descripción Electrónicos  8-bit AVR Microcontroller with 32K Bytes In-System Programmable Flash
Download  347 Pages
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA32-16AC Datasheet(HTML) 91 Page - ATMEL Corporation

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91
ATmega32(L)
2503J–AVR–10/06
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 written to TCNT1.
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.
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 84.
Counter Unit
The main part of the 16-bit Timer/Counter is the programmable 16-bit bi-directional
counter unit. Figure 41 shows a block diagram of the counter and its surroundings.
Assembly Code Example
(1)
TIM16_WriteTCNT1:
; Save global interrupt flag
in
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
i;
/* Save global interrupt flag */
sreg = SREG;
/* Disable interrupts */
_CLI();
/* Set TCNT1 to i */
TCNT1 = i;
/* Restore global interrupt flag */
SREG = sreg;
}


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