ATtiny261 Atmel Corporation, ATtiny261 Datasheet - Page 117

• Manufacturer Part Number: ATtiny261
• Manufacturer: Atmel Corporation

Specifications of ATtiny261

• Flash (kbytes): 2 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 20 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 4
• 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): 0.12
• Eeprom (bytes): 128
• 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: 6
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

12.12.3
2588E–AVR–08/10
TCCR1C – Timer/Counter1 Control Register C
• Bits 7,6 – COM1A1S, COM1A0S: Comparator A Output Mode, Shadow Bits 1 and 0
These are shadow bits of COM1A1 and COM1A0 in TCCR1A. Writing to bits COM1A1S and
COM1A0S will also change bits COM1A1 and COM1A0 in TCCR1A. Similary, changes written
to bits COM1A1 and COM1A0 in TCCR1A will show here.
See
• Bits 5,4 – COM1B1S, COM1B0S: Comparator B Output Mode, Shadow Bits 1 and 0
These are shadow bits of COM1B1 and COM1B0 in TCCR1A. Writing to bits COM1B1S and
COM1B0S will also change bits COM1B1 and COM1B0 in TCCR1A. Similary, changes written
to bits COM1B1 and COM1B0 in TCCR1A will show here.
See
• Bits 3,2 – COM1D1, COM1D0: Comparator D Output Mode, Bits 1 and 0
These bits control the behaviour of the Waveform Output (OCW1D) and the connection of the
Output Compare pin (OC1D). If one or both of the COM1D1:0 bits are set, the OC1D output
overrides the normal port functionality of the I/O pin it is connected to. The complementary
OC1D output is connected only in PWM modes when the COM1D1:0 bits are set to “01”. Note
that the Data Direction Register (DDR) bit corresponding to the OC1D pin must be set in order to
enable the output driver.
The function of the COM1D1:0 bits depends on the PWM1D and WGM11:10 bit settings.
12-18
PWM).
Table 12-18. Compare Output Mode, Normal Mode (non-PWM)
Table 12-19
set to Fast PWM Mode.
Table 12-19. Compare Output Mode, Fast PWM Mode
Bit
0x27 (0x47)
Read/Write
Initial value
COM1D1:0
COM1D1:0
“TCCR1A – Timer/Counter1 Control Register A” on page 112
“TCCR1A – Timer/Counter1 Control Register A” on page 112
00
01
10
11
00
01
10
11
shows the COM1D1:0 bit functionality when the PWM1D bit is set to a Normal Mode (non-
shows the COM1D1:0 bit functionality when the PWM1D and WGM11:10 bits are
COM1A1
OCW1D Behaviour
Normal port operation.
Cleared on Compare Match. Set when TCNT1=0x000.
Cleared on Compare Match. Set when TCNT1=0x000.
Set on Compare Match. Cleared when TCNT1=0x000.
R/W
OCW1D Behaviour
Normal port operation.
Toggle on Compare Match.
Clear on Compare Match.
Set on Compare Match.
S
7
0
COM1A0
R/W
S
6
0
COM1B1
R/W
S
5
0
COM1B0
R/W
S
4
0
COM1D1
R/W
3
0
COM1D0
R/W
2
0
OC1D Pin
Disconnected
Connected
Connected
Connected
OC1D Pin
Disconnected
Connected
Connected
Connected
for information on bit usage.
for information on bit usage.
FOC1D
R/W
1
0
PWM1D
R/W
OC1D Pin
Disconnected
Disconnected
Disconnected
Disconnected
0
0
Disconnected
Disconnected
OC1D Pin
Disconnected
Connected
TCCR1C
Table
117