ATtiny85 Atmel Corporation, ATtiny85 Datasheet - Page 70

• Manufacturer Part Number: ATtiny85
• Manufacturer: Atmel Corporation

Specifications of ATtiny85

• Flash (kbytes): 8 Kbytes
• Pin Count: 8
• Max. Operating Frequency: 20 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 3
• 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): 0.5
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 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

11.4
70
Counter Unit
ATtiny25/45/85
Figure 11-3. Timer/Counter0 Prescaler
The synchronization logic on the input pins (T0) in
69.
The main part of the 8-bit Timer/Counter is the programmable bi-directional counter unit.
11-4
Figure 11-4. Counter Unit Block Diagram
Signal description (internal signals):
PSR10
clk
shows a block diagram of the counter and its surroundings.
count
direction
clear
clk
top
bottom
T0
I/O
Tn
DATA BUS
Synchronization
TCNTn
Increment or decrement TCNT0 by 1.
Select between increment and decrement.
Clear TCNT0 (set all bits to zero).
Timer/Counter clock, referred to as clk
Signalize that TCNT0 has reached maximum value.
Signalize that TCNT0 has reached minimum value (zero).
Clear
direction
count
clear
bottom
Control Logic
Figure 11-3
top
TOVn
(Int.Req.)
clk
Tn
is shown in
Clock Select
clk
( From Prescaler )
T0
Detector
Edge
T0
in the following.
Figure 11-2 on page
2586N–AVR–04/11
Figure
Tn