ATMEGA8A-AUR Atmel, ATMEGA8A-AUR Datasheet - Page 73

• Manufacturer Part Number: ATMEGA8A-AUR
• Description: MCU AVR 8KB FLASH 16MHZ 32TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8A-AUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

14.7
14.7.1
14.7.2
14.7.3
8159D–AVR–02/11
Register Description
TCCR0 – Timer/Counter Control Register
TCNT0 – Timer/Counter Register
TIMSK – Timer/Counter Interrupt Mask Register
• Bit 2:0 – CS02:0: Clock Select
The three clock select bits select the clock source to be used by the Timer/Counter.
Table 14-2.
If external pin modes are used for the Timer/Counter0, transitions on the T0 pin will clock the
counter even if the pin is configured as an output. This feature allows software control of the
counting.
The Timer/Counter Register gives direct access, both for read and write operations, to the
Timer/Counter unit 8-bit counter.
• Bit 0 – TOIE0: Timer/Counter0 Overflow Interrupt Enable
When the TOIE0 bit is written to one, and the I-bit in the Status Register is set (one), the
Timer/Counter0 Overflow interrupt is enabled. The corresponding interrupt is executed if an
overflow in Timer/Counter0 occurs, i.e., when the TOV0 bit is set in the Timer/Counter Interrupt
Flag Register – TIFR.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
CS02
0
0
0
0
1
1
1
1
CS01
0
0
1
1
0
0
1
1
Clock Select Bit Description
OCIE2
R/W
R/W
R
7
–
0
7
0
7
0
CS00
TOIE2
0
1
0
1
0
1
0
1
R/W
R/W
R
6
–
0
6
0
6
0
Description
No clock source (Timer/Counter stopped).
clk
clk
clk
clk
clk
External clock source on T0 pin. Clock on falling edge.
External clock source on T0 pin. Clock on rising edge.
TICIE1
R/W
R/W
I/O
I/O
I/O
I/O
I/O
R
5
–
0
5
0
5
0
/(No prescaling)
/8 (From prescaler)
/64 (From prescaler)
/256 (From prescaler)
/1024 (From prescaler)
OCIE1A
R/W
R/W
R
4
–
0
4
0
4
0
TCNT0[7:0]
OCIE1B
R/W
R/W
R
3
–
0
3
0
3
0
TOIE1
CS02
R/W
R/W
R/W
2
0
2
0
2
0
CS01
R/W
R/W
R/W
1
0
1
0
1
–
0
ATmega8A
TOIE0
CS00
R/W
R/W
R/W
0
0
0
0
0
0
TCCR0
TCNT0
TIMSK
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