2.2.1 Spesifikasi ATmega8535
• High-performance, Low-power AVR® 8-bit Microcontroller
• Advanced RISC Architecture
– 130 Powerful Instructions – Most Single Clock Cycle Execution – 32 x 8 General Purpose Working Registers
– Fully Static Operation – Up to 16 MIPS Throughput at 16 MHz
– On-chip 2-cycle Multiplier •
Nonvolatile Program and Data Memories – 8K Bytes of In-System Self-Programmable Flash
Endurance: 10,000 WriteErase Cycles – Optional Boot Code Section with Independent Lock Bits
In-System Programming by On-chip Boot Program True Read-While-Write Operation
– 512 Bytes EEPROM Endurance: 100,000 WriteErase Cycles
– 512 Bytes Internal SRAM – Programming Lock for Software Security
• Peripheral Features
– Two 8-bit TimerCounters with Separate Prescalers and Compare Modes – One 16-bit TimerCounter with Separate Prescaler, Compare Mode, and
Capture Mode – Real Time Counter with Separate Oscillator
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– Four PWM Channels – 8-channel, 10-bit ADC
8 Single-ended Channels 7 Differential Channels for TQFP Package Only
2 Differential Channels with Programmable Gain at 1x, 10x, or 200x for TQFP Package Only
– Byte-oriented Two-wire Serial Interface – Programmable Serial USART
– MasterSlave SPI Serial Interface – Programmable Watchdog Timer with Separate On-chip Oscillator
– On-chip Analog Comparator •
Special Microcontroller Features – Power-on Reset and Programmable Brown-out Detection
– Internal Calibrated RC Oscillator – External and Internal Interrupt Sources
– Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby and Extended Standby
• IO and Packages
– 32 Programmable IO Lines – 40-pin PDIP, 44-lead TQFP, 44-lead PLCC, and 44-pad MLF
• Operating Voltages
– 2.7 - 5.5V for ATmega8535L – 4.5 - 5.5V for ATmega8535
• Speed Grades
– 0 - 8 MHz for ATmega8535L
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– 0 - 16 MHz for ATmega8535
2.2.2. Konfigurasi Pin AVR ATmega8535
Konfigurasi pin-pin Atmega8535 dapat kita lihat pada gambar di bawah ini:
Gambar 2.2. Pin-pin ATmega8535
Alternatif PORT A
PORT A memiliki fungsi input output dan juga sebagai input analog yang akan dikonversi menjadi data–data digital ADC, seperti yang ditunjukkan pada tabel di
bawah. Jika salah satu PORT A dikonfigurasi kan sebagai output ketika PORT A difungsikan sebagai ADC maka hasil pengkonversian analog ke digital akan
menghasilkan data error.
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Untuk mengaktifkan fungsi ADC pada PORT A dengan Code Vision AVR akan dibahas di bab selanjutnya tentang teknik pemrogram C pada ATmega8535
dengan menggunakan software yang telah disebutkan di atas.
Fungsi PORT A dapat kita lihat pada tabel di bawah ini:
Tabel 2. 2 PORT A Port
Fungsi Alternatif
PA7 ADC7 ADC input channel 7 PA6 ADC6 ADC input channel 6
PA5 ADC5 ADC input channel 5 PA4 ADC4 ADC input channel 4
PA3 ADC3 ADC input channel 3 PA2 ADC2 ADC input channel 2
PA1 ADC1 ADC input channel 1 PA0 ADC0 ADC input channel 0
Alternatif PORT B
Fungsi PORT B dapat dilihat di tabel di bawah ini:
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Tabel 2. 3 PORT B PORT
Fungsi Alternatif
PB7 SCKSPI Bus Serial Clock
PB6 MISOSPI bus master inputslave output
PB5 MOSISPI Bus Master Output Slave Input
PB4 SS SPI Slave Select Input
PB3 AIN1Analog Comparator Negative Input OCO
TIMER COUNTER OUTPUT COMPARATOR MATCH OUTPUT
PB2 AIN0 Analog Comparator Positive Input INT2
External Interrupt 2 Input PB1
T1 TimerCounter External Counter Input
PB0 T0T1 TimerCounter External Counter Input XCX
USART EXTERNAL CLOCK INPUTOUTPUT
Alternatif PORT C
Fungsi PORT C dapat dilihat pada tabel di bawah ini:
Tabel 2. 4 Fungsi PORT C PORTC
FUNGSI KHUSUS PC7
TOSC2TIMER OSCILATOR PIN2 PC6
TOSC1TIMER OSCILATOR PIN1 PC5
TDIJTAG TEST DATA IN PC4
TDOJTAG TEST DATA OUT
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PC3 TMSJTAG TEST MODE SELECT
PC2 TCKJTAG TEST CLOCK
PC1 SDATWO WIRE SERIAL BUS DATA INOUT LINE
PC0 SCLTWO WIRE SERIAL BUS CLOCK LINE
Alternatif PORTD
Fungsi PORT D dapat dilihat pada tabel di bawah ini:
Tabel 2. 5 Fungsi PORT D PIN FUNGSI KHUSUS
7 OC2 TIMER COUNTER2 COMPARE MATCH OUTPUT
6 ICP TIMERCOUNTER1 INPUT COMPARE CAPTURE PIN
5 OC1A TIMERCOUNTER1 OUTPUT COMPARE A MATCH OUT
4 OC1B TIMERCOUNTER OUTPUT COMPARE B MATCH OUTPUT
3 INT1 EXTERNAL INTERRUPT 1 INPUT
2 INT0 EXTERNAL INTERRUPT 0 INPUT
1 TXD USART OUTPUT PIN
RXD USART INPUT PIN
2.2.3. Program Memori
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