ATtiny461 Automotive Atmel Corporation, ATtiny461 Automotive Datasheet - Page 29

• 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

7.6
7753F–AVR–01/11
Calibrated Internal RC Oscillator
By default, the Internal RC Oscillator provides an approximate 8.0 MHz clock. Though voltage
and temperature dependent, this clock can be very accurately calibrated by the user. See
23-1 on page 189
shipped with the CKDIV8 Fuse programmed. See
more details.
This clock may be selected as the system clock by programming the CKSEL Fuses as shown in
Table 7-6 on page
hardware loads the pre-programmed calibration value into the OSCCAL Register and thereby
automatically calibrates the RC Oscillator. The accuracy of this calibration is shown as Factory
calibration in
By changing the OSCCAL register from SW, see
page
The accuracy of this calibration is shown as User calibration in
When this Oscillator is used as the chip clock, the Watchdog Oscillator will still be used for the
Watchdog Timer and for the Reset Time-out. For more information on the pre-programmed cali-
bration value, see the section
Table 7-6.
Notes:
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table 7-7 on page
Table 7-7.
Note:
SUT1..0
10
00
01
11
32, it is possible to get a higher calibration accuracy than by using the factory calibration.
(1)
1. The device is shipped with this option selected.
2. If 8 MHz frequency exceeds the specification of the device (depends on V
1. The device is shipped with this option selected.
Fuse can be programmed in order to divide the internal frequency by 8.
Table 23-1 on page
Internal Calibrated RC Oscillator Operating Modes
Start-up Times for the Internal Calibrated RC Oscillator Clock Selection
Frequency Range (MHz)
from Power-down
and
29.
29. If selected, it will operate with no external components. During reset,
Start-up Time
“Internal Oscillator Speed” on page 207
7.84 - 8.16
6 CK
6 CK
6 CK
“Calibration Byte” on page
189.
ATtiny261/ATtiny461/ATtiny861
Additional Delay from
Reset (V
Reserved
“OSCCAL – Oscillator Calibration Register” on
14CK + 64 ms
14CK + 4 ms
“System Clock Prescaler” on page 32
14CK
CC
173.
= 5.0V)
Table 23-1 on page
for more details. The device is
(1)(2)
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
CKSEL3..0
0010
CC
), the CKDIV8
189.
Table
for
29