ATtiny461A Atmel Corporation, ATtiny461A Datasheet - Page 28

• Manufacturer Part Number: ATtiny461A
• Manufacturer: Atmel Corporation

Specifications of ATtiny461A

• Flash (kbytes): 4 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 20 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: Yes
• 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

6.2.3
28
ATtiny261A/461A/861A
Calibrated Internal 8 MHz Oscillator
When the PLL output is selected as clock source, the start-up times are determined by SUT fuse
bits as shown in
Table 6-5.
By default, the Internal Oscillator provides an approximately 8 MHz clock signal. Though voltage
and temperature dependent, this clock can be very accurately calibrated by the user. See
19-2 on page 187
with the CKDIV8 Fuse programmed. See
This clock may be selected as the system clock by programming the CKSEL Fuses as shown in
Table
the pre-programmed calibration value into the OSCCAL Register and thereby automatically cal-
ibrates the internal oscillator. The accuracy of this calibration is shown as Factory calibration in
Table 19-2 on page
Table 6-6.
Notes:
When this oscillator is selected, start-up times are determined by SUT fuses as shown in
6-7.
Table 6-7.
Note:
SUT[1:0]
SUT[1:0]
10
00
01
10
11
00
01
11
(2)
6-6. If selected, it will operate with no external components. During reset, hardware loads
1. The device is shipped with this option selected.
2. If the oscillator frequency exceeds the specification of the device (depends on V
1. If the RSTDISBL fuse is programmed, this start-up time will be increased to 14CK + 4 ms to
2. The device is shipped with this option selected.
CKDIV8 Fuse can be programmed to divide the internal frequency by 8.
ensure programming mode can be entered.
14CK + 16K (16384) + 64 ms
CKSEL[3:0]
14CK + 16K (16384) + 4 ms
14CK + 1K (1024) + 64 ms
14CK + 1K (1024) + 4 ms
Start-up Times for the PLLCK
Internal Calibrated Oscillator Operating Modes
Start-up Times for the Internal Calibrated Oscillator Clock Selection
0010
Table
Start-up Time from
and
from Power-down
Power Down
(1)
187.
Start-up Time
“Internal Oscillators” on page 222
6-5.
6 CK
6 CK
6 CK
“System Clock Prescaler” on page 31
Power-On-Reset (V
Additional Delay from
Additional Delay from
Reset (V
Reserved
14CK + 64 ms
14CK + 4 ms
14CK
4 ms
4 ms
4 ms
4 ms
CC
Nominal Frequency
for more details. The device is shipped
(1)
= 5.0V)
CC
8.0 MHz
= 5.0V)
(2)
Recommended
Usage
BOD enabled
Fast rising power
Slowly rising power
Recommended
usage
BOD enabled
Fast rising power
Slowly rising power
Slowly rising power
for more details.
8197C–AVR–05/11
CC
), the
Table
Table