ATMEGA8535L-8AC Atmel, ATMEGA8535L-8AC Datasheet - Page 40
ATMEGA8535L-8AC
Manufacturer Part Number
ATMEGA8535L-8AC
Description
IC AVR MCU 8K LV 8MHZ COM 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8535L-8AC
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
0°C ~ 70°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
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Part Number:
ATMEGA8535L-8AC
Manufacturer:
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Watchdog Reset
MCU Control and Status
Register – MCUCSR
40
ATmega8535(L)
When the Watchdog times out, it will generate a short reset pulse of one CK cycle dura-
tion. On the falling edge of this pulse, the delay timer starts counting the Time-out period
t
Figure 20. Watchdog Reset During Operation
The MCU Control and Status Register provides information on which reset source
caused an MCU Reset.
• Bit 3 – WDRF: Watchdog Reset Flag
This bit is set if a Watchdog Reset occurs. The bit is reset by a Power-on Reset, or by
writing a logic zero to the flag.
• Bit 2 – BORF: Brown-out Reset Flag
This bit is set if a Brown-out Reset occurs. The bit is reset by a Power-on Reset, or by
writing a logic zero to the flag.
• Bit 1 – EXTRF: External Reset Flag
This bit is set if an External Reset occurs. The bit is reset by a Power-on Reset, or by
writing a logic zero to the flag.
• Bit 0 – PORF: Power-on Reset Flag
This bit is set if a Power-on Reset occurs. The bit is reset only by writing a logic zero to
the flag.
To make use of the Reset Flags to identify a reset condition, the user should read and
then reset the MCUCSR as early as possible in the program. If the register is cleared
before another reset occurs, the source of the reset can be found by examining the
Reset Flags.
TOUT
Bit
Read/Write
Initial Value
. Refer to page 41 for details on operation of the Watchdog Timer.
CC
R/W
7
–
0
ISC2
R/W
6
0
R
5
–
0
CK
R/W
4
–
WDRF
R/W
3
See Bit Description
BORF
R/W
2
EXTRF
R/W
1
PORF
R/W
0
2502K–AVR–10/06
MCUCSR
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