ATTINY861V-10SUR Atmel, ATTINY861V-10SUR Datasheet - Page 94
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ATTINY861V-10SUR
Manufacturer Part Number
ATTINY861V-10SUR
Description
IC MCU AVR 8K FLASH 10MHZ 20SOIC
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY861V-10SUR
Core Processor
AVR
Core Size
8-Bit
Speed
10MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
16
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 11x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Manufacturer
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12.4.1
12.5
94
Output Compare Unit
ATtiny261/461/861
Counter Initialization for Asynchronous Mode
To set Timer/Counter1 to asynchronous mode follow the procedure below:
The comparator continuously compares TCNT1 with the Output Compare Registers (OCR1A,
OCR1B, OCR1C and OCR1D). Whenever TCNT1 equals to the Output Compare Register, the
comparator signals a match. A match will set the Output Compare Flag (OCF1A, OCF1B or
OCF1D) at the next timer clock cycle. If the corresponding interrupt is enabled, the Output Com-
pare Flag generates an Output Compare interrupt. The Output Compare Flag is automatically
cleared when the interrupt is executed. Alternatively, the flag can be cleared by software by writ-
ing a logical one to its I/O bit location. The Waveform Generator uses the match signal to
generate an output according to operating mode set by bits PWM1A, PWM1B, WGM11:10 and
COM1x1:0. The top and bottom signals are used by the Waveform Generator for handling the
special cases of the extreme values in some modes of operation
page
Figure 12-5. Output Compare Unit, Block Diagram
The OCR1x Registers are double buffered when using any of the Pulse Width Modulation
(PWM) modes. For the normal mode of operation, the double buffering is disabled. The double
buffering synchronizes the update of the OCR1x Compare Registers to either top or bottom of
the counting sequence. The synchronization prevents the occurrence of odd-length, non-sym-
1. Enable PLL.
2. Wait 100 µs for PLL to stabilize.
3. Poll the PLOCK bit until it is set.
4. Set the PCKE bit in the PLLCSR register which enables the asynchronous mode.
99.).
Figure 12-5
BOTTOM
FOCn
OCRnx
TOP
shows a block diagram of the Output Compare unit.
10-BIT OCRnx
Waveform Generator
=
8-BIT DATA BUS
(10-bit Comparator )
OCWnx
TCnH
10-BIT TCNTn
(See “Modes of Operation” on
TCNTn
COMnX1:0
PWMnx
WGM10
OCFnx (Int.Req.)
2588E–AVR–08/10
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