ATtiny25 Automotive Atmel Corporation, ATtiny25 Automotive Datasheet - Page 82

• 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

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ATtiny25/45/85
Figure 14-2. Timer/Counter 1 Synchronization Register Block Diagram.
Timer/Counter1 and the prescaler allow running the CPU from any clock source while the pres-
caler is operating on the fast 64 MHz (or 32 MHz in Low Speed Mode) PCK clock in the
asynchronous mode.
Note that the system clock frequency must be lower than one third of the PCK frequency. The
synchronization mechanism of the asynchronous Timer/Counter1 needs at least two edges of
the PCK when the system clock is high. If the frequency of the system clock is too high, it is a
risk that data or control values are lost.
The following
PCKE
CK
PCK
SYNC
MODE
ASYNC
MODE
IO-registers
Figure 14-3
OCR1B
OCF1A
OCR1C
OCF1B
OCR1A
TCCR1
GTCCR
TCNT1
TOV1
1 - 2 PCK Delay
1/2 CK Delay
shows the block diagram for Timer/Counter1.
S
A
Input synchronization
registers
OCR1A_SI
OCR1B_SI
OCR1C_SI
TCCR1_SI
GTCCR_SI
TCNT1_SI
OCF1A_SI
OCF1B_SI
TOV1_SI
1 PCK Delay
1 CK Delay
S
A
8-BIT DATABUS
Timer/Counter1
TCNT1
~1 CK Delay
1 CK Delay
Output synchronization
registers
TCNT_SO
OCF1A_SO
OCF1B_SO
TOV1_SO
1/2 CK Delay
No Delay
7598H–AVR–07/09
TCNT1
OCF1A
OCF1B
TOV1