ATmega88 Automotive Atmel Corporation, ATmega88 Automotive Datasheet - Page 109
ATmega88 Automotive
Manufacturer Part Number
ATmega88 Automotive
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT90CAN128_AUTOMOTIVE.pdf
(225 pages)
2.ATMEGA168_AUTOMOTIVE.pdf
(19 pages)
3.ATMEGA168_AUTOMOTIVE.pdf
(340 pages)
4.ATMEGA88_AUTOMOTIVE.pdf
(10 pages)
Specifications of ATmega88 Automotive
Flash (kbytes)
8 Kbytes
Pin Count
32
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
No
Max I/o Pins
23
Ext Interrupts
24
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
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
No
Crypto Engine
No
Sram (kbytes)
1
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 150
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
- AT90CAN128_AUTOMOTIVE PDF datasheet
- ATMEGA168_AUTOMOTIVE PDF datasheet #2
- ATMEGA168_AUTOMOTIVE PDF datasheet #3
- ATMEGA88_AUTOMOTIVE PDF datasheet #4
- Current page: 109 of 225
- Download datasheet (4Mb)
7701E–AVR–02/11
In inverting compare output mode, the operation is inverted. The dual-slope operation gives a
lower maximum operation frequency compared to the single-slope operation. However, due to
the symmetric feature of the dual-slope PWM modes, these modes are preferred for motor
control applications.
The main difference between the phase correct, and the phase and frequency correct PWM
mode is the time the OCR1x register is updated by the OCR1x buffer register (see
on page 107
The PWM resolution for the phase and frequency correct PWM mode can be defined by either
ICR1 or OCR1A. The minimum resolution allowed is 2 bits (ICR1 or OCR1A set to 0x0003),
and the maximum resolution is 16 bits (ICR1 or OCR1A set to max). The PWM resolution in
bits can be calculated using the following equation:
In phase and frequency correct PWM mode, the counter is incremented until the counter value
matches either the value in ICR1 (WGM13:0 = 8), or the value in OCR1A (WGM13:0 = 9). The
counter has then reached the top, and changes the count direction. The TCNT1 value will be
equal to top for one timer clock cycle. The timing diagram for the phase and frequency correct
PWM mode is shown on
rect PWM mode when OCR1A or ICR1 is used to define top. The TCNT1 value in the timing
diagram is shown as a histogram for illustrating the dual-slope operation. The diagram
includes non-inverted and inverted PWM outputs. The small horizontal lines on the TCNT1
slopes represent compare matches between OCR1x and TCNT1. The OC1x interrupt flag will
be set when a compare match occurs.
Figure 14-9. Phase and Frequency Correct PWM Mode, Timing Diagram
The timer/counter overflow flag (TOV1) is set on the same timer clock cycle on which the
OCR1x registers are updated with the double buffer value (at bottom). When either OCR1A or
ICR1 is used for defining the top value, the OC1A or ICF1 flag is set accordingly when TCNT1
has reached top. The interrupt flags can then be used to generate an interrupt each time the
counter reaches the top or bottom value.
R
PFCPWM
TCNTn
OCnx
OCnx
Period
=
and
log
---------------------------------- -
log
Figure 14-9 on page
TOP
2
1
+
1
Figure 14-9 on page
Atmel ATtiny24/44/84 [Preliminary]
2
109).
109. The figure shows phase and frequency cor-
3
4
OCnA Interrupt Flag Set
or ICFn Interrupt Flag Set
(Interrupt on TOP)
(COMnx1:0 = 2)
(COMnx1:0 = 3)
OCRnx/TOP Updateand
TOVn Interrupt Flag Set
(Interrupt on Bottom)
Figure 14-8
109
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