ATtiny25 Automotive Atmel Corporation, ATtiny25 Automotive Datasheet - Page 23

• 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

6.2
7598H–AVR–07/09
Clock Sources
Figure 6-2.
The device has the following clock source options, selectable by Flash Fuse bits as shown
below. The clock from the selected source is input to the AVR clock generator, and routed to the
appropriate modules.
Table 6-1.
Note:
The various choices for each clocking option is given in the following sections. When the CPU
wakes up from Power-down or Power-save, the selected clock source is used to time the
start-up, ensuring stable Oscillator operation before instruction execution starts. When the CPU
starts from reset, there is an additional delay allowing the power to reach a stable level before
commencing normal operation. The Watchdog Oscillator is used for timing this real-time part of
the start-up time. The number of WDT Oscillator cycles used for each time-out is shown in
6-2.
Device Clocking Option
External Clock
PLL Clock
Calibrated Internal RC Oscillator 8.0 MHz
Watchdog Oscillator 128 kHz
External Low-frequency Crystal
External Crystal/Ceramic Resonator
Reserved
XTAL1
XTAL2
1. For all fuses “1” means unprogrammed while “0” means programmed.
OSCCAL
8.0 MHz / 6.4 MHz
RC OSCILLATOR
PCK Clocking System
Device Clocking Options Select
PLLE
OSCILLATORS
PLLCK & CKSEL FUSES
8x / 4x
PLL
(1)
Detector
DIVIDE
Lock
BY 4
ATtiny25/45/85
CLKPS3..0
Prescaler
System
Clock
0101, 0111, 0011
CKSEL3..0
1000-1111
64 / 25.6 MHz
0000
0001
0010
0100
0110
PLOCK
SYSTEM
CLOCK
PCK
Table
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