ATMEGA8535L-8PU Atmel, ATMEGA8535L-8PU Datasheet - Page 105
![IC AVR MCU 8K 8MHZ 3V 40DIP](/photos/6/70/67049/453-40-dip_sml.jpg)
ATMEGA8535L-8PU
Manufacturer Part Number
ATMEGA8535L-8PU
Description
IC AVR MCU 8K 8MHZ 3V 40DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8535L-8PU
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
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)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
Processor Series
ATMEGA8x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
512 B
Interface Type
2-Wire, SPI, USART
Maximum Clock Frequency
8 MHz
Number Of Programmable I/os
32
Number Of Timers
3
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
3rd Party Development Tools
EWAVR, EWAVR-BL
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 8 Channel
For Use With
ATSTK600 - DEV KIT FOR AVR/AVR32770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAGATAVRISP2 - PROGRAMMER AVR IN SYSTEMATSTK500 - PROGRAMMER AVR STARTER KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA8535L-8PU
Manufacturer:
TI
Quantity:
12 000
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2502K–AVR–10/06
OCR1A set to 0x0003), and the maximum resolution is 16-bit (ICR1 or OCR1A set to
MAX). The PWM resolution can be calculated in bits by using the following equation:
In phase correct PWM mode, the counter is incremented until the counter value
matches either one of the fixed values 0x00FF, 0x01FF, or 0x03FF (WGM13:0 = 1, 2, or
3), the value in ICR1 (WGM13:0 = 10), or the value in OCR1A (WGM13:0 = 11). 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 correct
PWM mode is shown on Figure 47. The figure shows phase correct PWM mode when
OCR1A or ICR1 is used to define TOP. The TCNT1 value is in the timing diagram
shown as a histogram for illustrating the dual-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 Compare Match occurs.
Figure 47. Phase Correct PWM Mode, Timing Diagram
The Timer/Counter Overflow Flag (TOV1) is set each time the counter reaches BOT-
TOM. When either OCR1A or ICR1 is used for defining the TOP value, the OC1A or
ICF1 Flag is set accordingly at the same timer clock cycle as the OCR1x Registers are
updated with the double buffer value (at TOP). The interrupt flags can be used to gener-
ate an interrupt each time the counter reaches the TOP or BOTTOM value.
When changing the TOP value, the program must ensure that the new TOP value is
higher or equal to the value of all of the compare registers. If the TOP value is lower
than any of the compare registers, a Compare Match will never occur between the
TCNT1 and the OCR1x. Note that when using fixed TOP values, the unused bits are
masked to zero when any of the OCR1x Registers are written. As the third period shown
in Figure 47 illustrates, changing the TOP actively while the Timer/Counter is running in
the phase correct mode can result in an unsymmetrical output. The reason for this can
be found in the time of update of the OCR1x Register. Since the OCR1x update occurs
at TOP, the PWM period starts and ends at TOP. This implies that the length of the fall-
TCNTn
OCnx
OCnx
Period
1
R
PCPWM
2
=
log
---------------------------------- -
(
log
TOP
3
2 ( )
+
1
)
ATmega8535(L)
4
OCRnx/TOP Update and
OCnA Interrupt Flag Set
or ICFn Interrupt Flag Set
(Interrupt on TOP)
TOVn Interrupt Flag Set
(Interrupt on Bottom)
(COMnx1:0 = 2)
(COMnx1:0 = 3)
105
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