ATMEGA64-16MC Atmel, ATMEGA64-16MC Datasheet - Page 106

• Manufacturer Part Number: ATMEGA64-16MC
• Description: IC AVR MCU 64K 16MHZ COM 64-QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA64-16MC

• 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: 53
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 64-MLF®, 64-QFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

TCNT0 –
Timer/Counter
Register
OCR0 – Output
Compare Register
2490Q–AVR–06/10
• Bit 2:0 – CS02:0: Clock Select
The three Clock Select bits select the clock source to be used by the Timer/Counter, see
56.
Table 56. Clock Select Bit Description
The Timer/Counter Register gives direct access, both for read and write operations, to the
Timer/Counter unit 8-bit counter. Writing to the TCNT0 Register blocks (removes) the Compare
Match on the following timer clock. Modifying the counter (TCNT0) while the counter is running,
introduces a risk of missing a Compare Match between TCNT0 and the OCR0 Register.
The Output Compare Register contains an 8-bit value that is continuously compared with the
counter value (TCNT0). A match can be used to generate an Output Compare interrupt, or to
generate a waveform output on the OC0 pin.
Bit
0x32 (0x52)
Read/Write
Initial Value
Bit
0x31 (0x51)
Read/Write
Initial Value
CS02
0
0
0
0
1
1
1
1
CS01
R/W
R/W
0
0
1
1
0
0
1
1
7
0
7
0
R/W
R/W
6
0
6
0
CS00
0
1
0
1
0
1
0
1
R/W
R/W
5
0
5
0
Description
No clock source (Timer/counter stopped)
clk
clk
clk
clk
clk
clk
clk
T0S
T0S
T0S
T0S
T0S
T
T
0
0
S
S
/256 (From prescaler)
/1024 (From prescaler)
/(No prescaling)
/8 (From prescaler)
/32 (From prescaler)
/64 (From prescaler)
/128 (From prescaler)
R/W
R/W
4
0
4
0
TCNT0[7:0]
OCR0[7:0]
R/W
R/W
3
0
3
0
R/W
R/W
2
0
2
0
R/W
R/W
1
0
1
0
ATmega64(L)
R/W
R/W
0
0
0
0
TCNT0
OCR0
Table
106