ATtiny25 Automotive Atmel Corporation, ATtiny25 Automotive Datasheet - Page 91

• 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

7598H–AVR–07/09
Figure 14-5. Effects of Unsynchronized OCR Latching
During the time between the write and the latch operation, a read from OCR1A or OCR1B will
read the contents of the temporary location. This means that the most recently written value
always will read out of OCR1A or OCR1B.
When OCR1A or OCR1B contain $00 or the top value, as specified in OCR1C register, the out-
p u t P B 1 ( O C 1 A ) o r P B 3 ( O C 1 B ) i s h e l d l o w o r h i g h a c c o r d i n g t o t h e s e t t i n g s o f
COM1A1/COM1A0. This is shown in
Table 14-5.
In PWM mode, the Timer Overflow Flag - TOV1 is set when the TCNT1 counts to the OCR1C
value and the TCNT1 is reset to $00. The Timer Overflow Interrupt1 is executed when TOV1 is
set provided that Timer Overflow Interrupt and global interrupts are enabled. This also applies to
the Timer Output Compare flags and interrupts.
The frequency of the PWM will be Timer Clock 1 Frequency divided by (OCR1C value + 1). See
the following equation:
COM1x1
0
0
1
1
1
1
Unsynchronized OC1x Latch
Synchronized OC1x Latch
PWM Outputs OCR1x = $00 or OCR1C, x = A or B
COM1x0
1
1
0
0
1
1
f
OCR1C
OCR1C
OCR1C
OCR1x
Table
PWM
$00
$00
$00
=
14-5.
----------------------------------- -
OCR1C + 1
Glitch
f
Compare Value changes
Compare Value changes
TCK1
Output OC1x
H
H
H
L
L
L
ATtiny25/45/85
Counter Value
Compare Value
PWM Output OC1x
Counter Value
Compare Value
PWM Output OC1x
Not connected.
Not connected.
Not connected.
Not connected.
Output OC1x
H
L
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