ATTINY861-15MZ Atmel, ATTINY861-15MZ Datasheet - Page 98

• Manufacturer Part Number: ATTINY861-15MZ
• Description: MCU AVR 8K FLASH 15MHZ 32-QFN
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY861-15MZ

• Package / Case: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Speed: 16MHz
• Number Of I /o: 16
• Eeprom Size: 512 x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Program Memory Size: 8KB (8K x 8)
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Connectivity: USI
• Core Size: 8-Bit
• Processor Series: ATTINY8x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: SPI
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 16
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATAVRMC320
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 11 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

16.5
98
Dead Time Generator
ATtiny261/461/861
The Dead Time Generator is provided for the Timer/Counter1 PWM output pairs to allow driving
external power control switches safely. The Dead Time Generator is a separate block that can
be used to insert dead times (non-overlapping times) for the Timer/Counter1 complementary
output pairs OC1x and OC1x when the PWM mode is enabled and the COM1x1:0 bits are set to
“01”. The sharing of tasks is as follows: the Waveform Generator generates the Waveform Out-
put (OCW1x) and the Dead Time Generator generates the non-overlapping PWM output pair
from the Waveform Output. Three Dead Time Generators are provided, one for each PWM out-
put. The non-overlap time is adjustable and the PWM output and it’s complementary output are
adjusted separately, and independently for both PWM outputs.
Figure 16-6. Output Compare Unit, Block Diagram
The Dead Time Generation is based on the 4-bit down counters that count the dead time, as
shown in
can divide the Timer/Counter1 clock (PCK or CK) by 1, 2, 4 or 8. This provides for large range of
dead times that can be generated. The prescaler is controlled by two control bits DTPS11..10.
The block has also a rising and falling edge detector that is used to start the dead time counting
period. Depending on the edge, one of the transitions on the rising edges, OC1x or OC1x is
delayed until the counter has counted to zero. The comparator is used to compare the counter
with zero and stop the dead time insertion when zero has been reached. The counter is loaded
with a 4-bit DT1H or DT1L value from DT1 I/O register, depending on the edge of the Waveform
Output (OCW1x) when the dead time insertion is started. The Output Compare Output are
delayed by one timer clock cycle at minimum from the Waveform Output when the Dead Time is
adjusted to zero. The outputs OC1x and OC1x are inverted, if the PWM Inversion Mode bit
PWM1X is set. This will also cause both outputs to be high during the dead time.
Figure 16-7. Dead Time Generator
CK OR PCK
OCWnx
CLOCK
bottom
FOCn
top
TCCRnB REGISTER
Figure
PRE-SCALER
DEAD TIME
16-7. There is a dedicated prescaler in front of the Dead Time Generator that
PWMnx
Waveform Generator
WGM10
CLOCK CONTROL
COMnx
CK OR PCK
OCWnx
CLOCK
DTn I/O REGISTER
4-BIT COUNTER
COMPARATOR
DTPSn
Dead Time Generator
DATA BUS (8-bit)
DTnH
DTnL
OCnx
OCnx
PWM1X
PWM1X
2588B–AVR–11/06
OCnx
OCnx
pin
pin
OCnx
OCnx