ATtiny25 Automotive Atmel Corporation, ATtiny25 Automotive Datasheet - Page 28

• Manufacturer Part Number: ATtiny25 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATtiny25 Automotive

• Flash (kbytes): 2 Kbytes
• Pin Count: 8
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 4
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 6
• Ext Interrupts: 6
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 4
• 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 125
• 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: 5
• Pwm Channels: 6
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

6.7.1
6.8
28
128 kHz Internal Oscillator
ATtiny25/45/85
High Frequency PLL Clock - PLL
Note that the System Clock Prescaler can be used to implement run-time changes of the internal
clock frequency while still ensuring stable operation. Refer to
29
There is an internal PLL that provides nominally 64 MHz clock rate locked to the RC Oscillator
for the use of the Peripheral Timer/Counter1 and for the system clock source. When selected as
a system clock source, by programming the CKSEL fuses to ‘0001’, it is divided by four like
shown in
SUT fuses as shown in
Table 6-10.
Table 6-11.
The 128 kHz internal Oscillator is a low power Oscillator providing a clock of 128 kHz. The fre-
quency is nominal at 3V and 25°C. This clock may be select as the system clock by
programming the CKSEL Fuses to “11”.
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 6-12.
SUT1..0
SUT1..0
for details.
00
01
10
11
00
01
10
11
6-12.
Table
Power-down and Power-save
CKSEL3..0
Start-up Time from Power
PLLCK Operating Modes
Start-up Times for the PLLCK
Start-up Times for the 128 kHz Internal Oscillator
6-10. When this clock source is selected, start-up times are determined by the
Down and Power Save
0001
Start-up Time from
CLK
16K CK
16K CK
Table
1K CK
1K CK
6 CK
6 CK
6 CK
6-11. See also
“PCK Clocking System” on page
Additional Delay from
Additional Delay from
Reset (V
Reserved
14CK + 68 ms
14CK + 68 ms
14CK + 64 ms
14CK + 4 ms
14CK + 8ms
14CK + 8ms
Reset
14CK
CC
Nominal Frequency
= 5.0V)
“System Clock Prescaler” on page
16 MHz
Recommended usage
BOD enabled
Fast rising power
Slowly rising power
Slowly rising power
BOD enabled
Fast rising power
Slowly rising power
Recommended Usage
23.
7598H–AVR–07/09