ATMEGA8535-16MU Atmel, ATMEGA8535-16MU Datasheet - Page 238

• Manufacturer Part Number: ATMEGA8535-16MU
• Description: IC AVR MCU 8K 16MHZ 5V 44-QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8535-16MU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• 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): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-VQFN Exposed Pad
• Processor Series: ATMEGA8x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: 2-Wire, SPI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Operating Supply Voltage: 4.5 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• Package: 44MLF EP
• Device Core: AVR
• Family Name: ATmega
• Maximum Speed: 16 MHz
• For Use With: ATAVRISP2 - PROGRAMMER AVR IN SYSTEMATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Fuse Bits
238
ATmega8535(L)
Table 97. Lock Bit Protection Modes
Notes:
The ATmega8535 has two Fuse bytes. Table 98 and Table 99 describe briefly the func-
tionality of all the fuses and how they are mapped into the fuse bytes. Note that the
fuses are read as logical zero, “0”, if they are programmed.
Table 98. Fuse High Byte
Notes:
Fuse High Byte
S8535C
WDTON
SPIEN
CKOPT
EESAVE
BOOTSZ1
BOOTSZ0
BOOTRST
1
2
3
4
(1)
Memory Lock Bits
1. Program the Fuse bits before programming the Lock bits.
2. “1” means unprogrammed, “0” means programmed.
1. The SPIEN Fuse is not accessible in Serial Programming mode.
2. The CKOPT Fuse functionality depends on the setting of the CKSEL bits. See “Clock
3. The default value of BOOTSZ1..0 results in maximum Boot Size. See Table 93 on
(2)
Sources” on page 25. for details.
page 235.
1
1
0
0
Bit No
7
6
5
4
3
2
1
0
1
0
0
1
Description
Select AT90S8535 compatibility
mode
WDT always on
Enable Serial Program and Data
Downloading
Oscillator options
EEPROM memory is preserved
through the Chip Erase
Select Boot Size (see Table 93 for
details)
Select Boot Size (see Table 93 for
details)
Select Reset Vector
Protection Type
No restrictions for SPM or LPM accessing the Boot Loader
section.
SPM is not allowed to write to the Boot Loader section.
SPM is not allowed to write to the Boot Loader section,
and LPM executing from the Application section is not
allowed to read from the Boot Loader section. If interrupt
vectors are placed in the Application section, interrupts
are disabled while executing from the Boot Loader section.
LPM executing from the Application section is not allowed
to read from the Boot Loader section. If interrupt vectors
are placed in the Application section, interrupts are
disabled while executing from the Boot Loader section.
(2)
(Continued)
Default Value
1 (unprogrammed)
1 (unprogrammed, WDT
enabled by WDTCR)
0 (programmed, SPI prog.
enabled)
1 (unprogrammed)
1 (unprogrammed,
EEPROM not preserved)
0 (programmed)
0 (programmed)
1 (unprogrammed)
2502K–AVR–10/06
(3)
(3)