ATMEGA168PA-PU Atmel, ATMEGA168PA-PU Datasheet - Page 119
ATMEGA168PA-PU
Manufacturer Part Number
ATMEGA168PA-PU
Description
MCU, 8BIT, AVR, 16K FLASH, 28PDIP
Manufacturer
Atmel
Datasheet
1.ATMEGA48A-PU.pdf
(566 pages)
Specifications of ATMEGA168PA-PU
Controller Family/series
Atmega
No. Of I/o's
23
Eeprom Memory Size
512Byte
Ram Memory Size
1KB
Cpu Speed
20MHz
No.
RoHS Compliant
Core Size
8bit
Program Memory Size
16KB
Oscillator Type
External, Internal
Rohs Compliant
Yes
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15.3.1
15.4
8271C–AVR–08/10
Timer/Counter Clock Sources
Reusing the Temporary High Byte Register
Note:
The assembly code example requires that the r17:r16 register pair contains the value to be writ-
ten to TCNT1.
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.
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
ATmega48A/48PA/88A/88PA/168A/168PA/328/328
Assembly Code Example
C Code Example
TIM16_WriteTCNT1:
void TIM16_WriteTCNT1( unsigned int i )
{
}
; 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
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;
1.
See ”About Code Examples” on page 7.
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”.
”Timer/Counter0 and Timer/Counter1 Prescalers” on page
(1)
(1)
142.
119
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