ATmega64A Atmel Corporation, ATmega64A Datasheet - Page 157

• Manufacturer Part Number: ATmega64A
• Manufacturer: Atmel Corporation

Specifications of ATmega64A

• Flash (kbytes): 64 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 53
• Ext Interrupts: 8
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 4
• Eeprom (bytes): 2048
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 8
• Input Capture Channels: 2
• Pwm Channels: 7
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

17.9
17.9.1
8160C–AVR–07/09
Register Description
TCCR2 – Timer/Counter Control Register
Figure 17-10. Timer/Counter Timing Diagram, Setting of OCF2, with Prescaler (f
Figure 17-11
Figure 17-11. Timer/Counter Timing Diagram, Clear Timer on Compare Match Mode, with Pres-
• Bit 7 – FOC2: Force Output Compare
The FOC2 bit is only active when the WGM20 bit specifies a non-PWM mode. However, for
ensuring compatibility with future devices, this bit must be set to zero when TCCR2 is written
when operating in PWM mode. When writing a logical one to the FOC2 bit, an immediate Com-
pare Match is forced on the waveform generation unit. The OC2 output is changed according to
its COM21:0 bits setting. Note that the FOC2 bit is implemented as a strobe. Therefore it is the
value present in the COM21:0 bits that determines the effect of the forced compare.
Bit
0x25 (0x45)
Read/Write
Initial Value
TCNTn
TCNTn
(clk
(clk
OCRn
OCRn
(CTC)
OCFn
OCFn
clk
clk
clk
clk
I/O
I/O
I/O
I/O
Tn
Tn
/8)
/8)
shows the setting of OCF2 and the clearing of TCNT2 in CTC mode.
caler (f
FOC2
W
7
0
clk_I/O
WGM20
OCRn - 1
TOP - 1
R/W
6
0
/8)
COM21
R/W
5
0
COM20
R/W
OCRn
4
0
TOP
OCRn Value
WGM21
TOP
R/W
3
0
CS22
R/W
BOTTOM
OCRn + 1
2
0
CS21
R/W
1
0
ATmega64A
BOTTOM + 1
CS20
R/W
OCRn + 2
0
0
clk_I/O
/8)
TCCR2
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