ATtiny20 Atmel Corporation, ATtiny20 Datasheet - Page 166

• Manufacturer Part Number: ATtiny20
• Manufacturer: Atmel Corporation

Specifications of ATtiny20

• Flash (kbytes): 2 Kbytes
• Pin Count: 14
• Max. Operating Frequency: 12 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 5
• Hardware Qtouch Acquisition: Yes
• Max I/o Pins: 12
• Ext Interrupts: 12
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• 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
• Self Program Memory: NO
• 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: 4
• Input Capture Channels: 1
• Pwm Channels: 3
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

19.3.3.1
19.3.4
19.3.5
19.3.5.1
166
ATtiny20
Signature Section
Calibration Section
Latching of Configuration Bits
Latching of Calibration Value
All configuration bits are latched either when the device is reset or when the device exits the
external programming mode. Changes to configuration bit values have no effect until the device
leaves the external programming mode.
The signature section is a dedicated memory area used for storing miscellaneous device infor-
mation, such as the device signature. Most of this memory section is reserved for internal use,
as shown in
Table 19-6.
ATtiny20 has a three-byte signature code, which can be used to identify the device. The three
bytes reside in the signature section, as shown in
given in
Table 19-7.
ATtiny20 has one calibration byte. The calibration byte contains the calibration data for the inter-
nal oscillator and resides in the calibration section, as shown in
calibration byte is automatically written into the OSCCAL register to ensure correct frequency of
the calibrated internal oscillator.
Table 19-8.
To ensure correct frequency of the calibrated internal oscillator the calibration value is automati-
cally written into the OSCCAL register during reset.
Signature word address
0x00
0x01
0x02 ... 0x1F
Part
ATtiny20
Calibration word address
0x00
0x01 ... 0x0F
Table
Table
Signature bytes
19-7.
Signature codes
Calibration byte
19-6.
Manufacturer ID
High byte
Device ID 1
Reserved for internal use
Reserved for internal use
Calibration word data
High byte
Reserved
Reserved
0x1E
Table
Signature Bytes
Signature word data
Device ID 1
19-6. The signature data for ATtiny20 is
0x91
Low byte
Internal oscillator calibration value
Reserved
Low byte
Manufacturer ID
Device ID 2
Reserved for internal use
Table
19-8. During reset, the
Device ID 2
0x0F
8235B–AVR–04/11