ATtiny461 Automotive Atmel Corporation, ATtiny461 Automotive Datasheet - Page 100

• Manufacturer Part Number: ATtiny461 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATtiny461 Automotive

• Flash (kbytes): 4 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): 0.25
• Eeprom (bytes): 256
• 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

16.6
100
Compare Match Output Unit
ATtiny261/ATtiny461/ATtiny861
The length of the counting period is user adjustable by selecting the dead time prescaler setting
by using the DTPS11:10 control bits, and selecting then the dead time value in I/O register DT1.
The DT1 register consists of two 4-bit fields, DT1H and DT1L that control the dead time periods
of the PWM output and its' complementary output separately in terms of the number of pres-
caled dead time generator clock cycles. Thus the rising edge of OC1x and OC1x can have
different dead time periods as the t
t
Figure 16-8. The Complementary Output Pair, COM1x1:0 = 1
The Compare Output Mode (COM1x1:0) bits have two functions. The Waveform Generator uses
the COM1x1:0 bits for defining the inverted or non-inverted Waveform Output (OCW1x) at the
next Compare Match. Also, the COM1x1:0 bits control the OC1x and OC1x pin output source.
Figure 16-9
I/O Registers, I/O bits, and I/O pins in the figure are shown in bold. Only the parts of the general
I/O Port Control Registers (DDR and PORT) that are affected by the COM1x1:0 bits are shown.
In Normal Mode (non-PWM) the Dead Time Generator is disabled and it is working like a syn-
chronizer: the Output Compare (OC1x) is delayed from the Waveform Output (OCW1x) by one
timer clock cycle. Whereas in Fast PWM Mode and in Phase and Frequency Correct PWM
Mode when the COM1x1:0 bits are set to “01” both the non-inverted and the inverted Output
Compare output are generated, and an user programmable Dead Time delay is inserted for
these complementary output pairs (OC1x and OC1x). The functionality in PWM modes is similar
to Normal mode when any other COM1x1:0 bit setup is used. When referring to the OC1x state,
the reference is for the Output Compare output (OC1x) from the Dead Time Generator, not the
OC1x pin. If a system reset occur, the OC1x is reset to “0”.
The general I/O port function is overridden by the Output Compare (OC1x / OC1x) from the
Dead Time Generator if either of the COM1x1:0 bits are set. However, the OC1x pin direction
(input or output) is still controlled by the Data Direction Register (DDR) for the port pin. The Data
Direction Register bit for the OC1x and OC1x pins (DDR_OC1x and DDR_OC1x) must be set as
output before the OC1x and OC1x values are visible on the pin. The port override function is
independent of the Output Compare mode.
OCWnx
OCnx
OCnx
(COMnx = 1)
non-overlap / falling edge
t
non-overlap / rising edge
shows a simplified schematic of the logic affected by the COM1x1:0 bit setting. The
is adjusted by the 4-bit DT1L value.
t
non-overlap / falling edge
non-overlap / rising edge
is adjusted by the 4-bit DT1H value and the
7753F–AVR–01/11