ATMEGA8515-16PI Atmel, ATMEGA8515-16PI Datasheet - Page 111
![IC AVR MCU 8K 16MHZ IND 40-DIP](/photos/6/70/67049/453-40-dip_sml.jpg)
ATMEGA8515-16PI
Manufacturer Part Number
ATMEGA8515-16PI
Description
IC AVR MCU 8K 16MHZ IND 40-DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8515-16PI
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
EBI/EMI, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
35
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Data Converters
-
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Fast PWM Mode
2512K–AVR–01/10
The fast Pulse Width Modulation or fast PWM mode (WGM13:0 = 5, 6, 7, 14, or 15) pro-
vides a high frequency PWM waveform generation option. The fast PWM differs from
the other PWM options by its single-slope operation. The counter counts from BOTTOM
to TOP then restarts from BOTTOM. In non-inverting Compare Output mode, the output
compare (OC1x) is set on the Compare Match between TCNT1 and OCR1x, and
cleared at BOTTOM. In inverting Compare Output mode output is cleared on Compare
Match and set at BOTTOM. Due to the single-slope operation, the operating frequency
of the fast PWM mode can be twice as high as the phase correct and phase and fre-
quency correct PWM modes that use dual-slope operation. This high frequency makes
the fast PWM mode well suited for power regulation, rectification, and DAC applications.
High frequency allows physically small sized external components (coils, capacitors),
hence reduces total system cost.
The PWM resolution for fast PWM can be fixed to 8-, 9-, or 10-bit, or defined by either
ICR1 or OCR1A. The minimum resolution allowed is 2-bit (ICR1 or OCR1A set to
0x0003), and the maximum resolution is 16-bit (ICR1 or OCR1A set to MAX). The PWM
resolution in bits can be calculated by using the following equation:
In fast PWM mode the counter is incremented until the counter value matches either
one of the fixed values 0x00FF, 0x01FF, or 0x03FF (WGM13:0 = 5, 6, or 7), the value in
ICR1 (WGM13:0 = 14), or the value in OCR1A (WGM13:0 = 15). The counter is then
cleared at the following timer clock cycle. The timing diagram for the fast PWM mode is
shown in Figure 53. The figure shows fast PWM mode when OCR1A or ICR1 is used to
define TOP. The TCNT1 value is in the timing diagram shown as a histogram for illus-
trating the single-slope operation. The diagram includes non-inverted and inverted PWM
outputs. The small horizontal line marks on the TCNT1 slopes represent Compare
Matches between OCR1x and TCNT1. The OC1x Interrupt Flag will be set when a Com-
pare Match occurs.
Figure 53. Fast PWM Mode, Timing Diagram
The Timer/Counter Overflow Flag (TOV1) is set each time the counter reaches TOP. In
addition the OC1A or ICF1 Flag is set at the same timer clock cycle as TOV1 is set
when either OCR1A or ICR1 is used for defining the TOP value. If one of the interrupts
TCNTn
OCnx
OCnx
Period
1
2
3
R
FPWM
4
=
5
log
---------------------------------- -
6
(
log
TOP
2 ( )
7
+
1
)
ATmega8515(L)
8
OCRnx / TOP Update
and TOVn Interrupt Flag
Set and OCnA Interrupt
Flag Set or ICFn
Interrupt Flag Set
(Interrupt on TOP)
(COMnx1:0 = 2)
(COMnx1:0 = 3)
111
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