ATtiny25 Automotive Atmel Corporation, ATtiny25 Automotive Datasheet - Page 72

• Manufacturer Part Number: ATtiny25 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATtiny25 Automotive

• Flash (kbytes): 2 Kbytes
• Pin Count: 8
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 4
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 6
• Ext Interrupts: 6
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 4
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.12
• Eeprom (bytes): 128
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 125
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 5
• Pwm Channels: 6
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

12.8
12.8.1
72
8-bit Timer/Counter Register Description
ATtiny25/45/85
Timer/Counter Control Register A – TCCR0A
Figure 12-11. Timer/Counter Timing Diagram, Clear Timer on Compare Match mode, with Pres-
• Bits 7:6 – COM01A:0: Compare Match Output A Mode
These bits control the Output Compare pin (OC0A) behavior. If one or both of the COM0A1:0
bits are set, the OC0A output overrides the normal port functionality of the I/O pin it is connected
to. However, note that the Data Direction Register (DDR) bit corresponding to the OC0A pin
must be set in order to enable the output driver.
When OC0A is connected to the pin, the function of the COM0A1:0 bits depends on the
WGM02:0 bit setting.
are set to a normal or CTC mode (non-PWM).
Table 12-1.
Table 12-2
mode.
Table 12-2.
Bit
Read/Write
Initial Value
COM01
COM01
TCNTn
(clk
OCRnx
(CTC)
OCFnx
clk
clk
0
0
1
1
0
I/O
I/O
Tn
/8)
shows the COM0A1:0 bit functionality when the WGM01:0 bits are set to fast PWM
COM0A1
caler (f
Compare Output Mode, non-PWM Mode
Compare Output Mode, Fast PWM Mode
R/W
7
0
COM00
COM00
0
1
0
1
0
clk_I/O
Table 12-1
COM0A0
TOP - 1
R/W
6
0
/8)
Description
Normal port operation, OC0A disconnected.
Toggle OC0A on Compare Match
Clear OC0A on Compare Match
Set OC0A on Compare Match
Description
Normal port operation, OC0A disconnected.
COM0B1
shows the COM0A1:0 bit functionality when the WGM02:0 bits
R/W
5
0
COM0B0
R/W
TOP
4
0
TOP
R
3
0
–
(1)
BOTTOM
R
2
–
0
WGM01
R/W
1
0
BOTTOM + 1
WGM00
R/W
0
0
7598H–AVR–07/09
TCCR0A