ATtiny861 Automotive Atmel Corporation, ATtiny861 Automotive Datasheet - Page 71

• Manufacturer Part Number: ATtiny861 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATtiny861 Automotive

• Flash (kbytes): 8 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 16
• Ext Interrupts: 16
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• 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 150
• 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: 6
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

13.1
13.1.1
7753F–AVR–01/11
Register Description
TCCR0B – Timer/Counter0 Control Register B
However, due to variation of the system clock frequency and duty cycle caused by Oscillator
source (crystal, resonator, and capacitors) tolerances, it is recommended that maximum fre-
quency of an external clock source is less than f
An external clock source can not be prescaled.
Figure 13-2. Prescaler for Timer/Counter0
Note:
• Bit 4 – TSM: Timer/Counter Synchronization Mode
Writing the TSM bit to one activates the Timer/Counter Synchronization mode. In this mode, the
value that is written to the PSR0 bit is kept, hence keeping the Prescaler Reset signal asserted.
This ensures that the Timer/Counter is halted and can be configured without the risk of advanc-
ing during configuration. When the TSM bit is written to zero, the PSR0 bit is cleared by
hardware, and the Timer/Counter start counting.
• Bit 3 – PSR0: Prescaler Reset Timer/Counter0
When this bit is one, the Timer/Counter0 prescaler will be Reset. This bit is normally cleared
immediately by hardware, except if the TSM bit is set.
• Bits 2, 1, 0 – CS02, CS01, CS00: Clock Select0, Bit 2, 1, and 0
The Clock Select0 bits 2, 1, and 0 define the prescaling source of Timer0.
Bit
0x33 (0x53)
Read/Write
Initial Value
1. The synchronization logic on the input pins (
PSR0
clk
T0
I/O
R
7
0
-
Synchronization
R
6
0
-
R
5
0
-
Clear
ATtiny261/ATtiny461/ATtiny861
TSM
R/W
4
0
clk_I/O
T0)
PSR0
R/W
/2.5.
3
0
is shown in
CS02
R/W
2
0
Figure
clk
T0
CS01
R/W
13-1.
1
0
CS01
R/W
0
0
TCCR0B
71