ATMEGA8535-16AI Atmel, ATMEGA8535-16AI Datasheet - Page 203

• Manufacturer Part Number: ATMEGA8535-16AI
• Description: IC AVR MCU 8K 16MHZ IND 44-TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8535-16AI

• 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-TQFP, 44-VQFP
• 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: 2 x 8 bit
• Operating Supply Voltage: 4.5 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 2 bit
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Analog Comparator
Special Function IO Register –
SFIOR
Analog Comparator Control
and Status Register – ACSR
2502K–AVR–10/06
The Analog Comparator compares the input values on the positive pin AIN0 and nega-
tive pin AIN1. When the voltage on the positive pin AIN0 is higher than the voltage on
the negative pin AIN1, the Analog Comparator Output, ACO, is set. The comparator’s
output can be set to trigger the Timer/Counter1 Input Capture function. In addition, the
comparator can trigger a separate interrupt, exclusive to the Analog Comparator. The
user can select Interrupt triggering on comparator output rise, fall or toggle. A block dia-
gram of the comparator and its surrounding logic is shown in Figure 97.
Figure 97. Analog Comparator Block Diagram
Notes:
• Bit 3 – ACME: Analog Comparator Multiplexer Enable
When this bit is written logic one and the ADC is switched off (ADEN in ADCSRA is
zero), the ADC multiplexer selects the negative input to the Analog Comparator. When
this bit is written logic zero, AIN1 is applied to the negative input of the Analog Compar-
ator. For a detailed description of this bit, see “Analog Comparator Multiplexed Input” on
page 205.
• Bit 7 – ACD: Analog Comparator Disable
When this bit is written logic one, the power to the Analog Comparator is switched off.
This bit can be set at any time to turn off the Analog Comparator. This will reduce power
consumption in active and Idle mode. When changing the ACD bit, the Analog Compar-
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
ADC MULTIPLEXER
REFERENCE
ACME
ADEN
BANDGAP
OUTPUT
1. See Table 81 on page 205.
2. Refer to Figure 1 on page 2 and Table 26 on page 60 for Analog Comparator pin
placement.
ADTS2
R/W
(1)
ACBG
7
0
ACD
R/W
7
0
ADTS1
R/W
ACBG
R/W
6
0
6
0
ADTS0
ACO
R/W
N/A
R
5
5
0
R/W
ACI
4
0
R
4
–
0
(2)
ACIE
R/W
ACME
3
0
R/W
3
0
ACIC
R/W
2
0
ATmega8535(L)
PUD
R/W
2
0
ACIS1
R/W
PSR2
1
0
R/W
1
0
ACIS0
PSR10
R/W
R/W
0
0
0
0
SFIOR
ACSR
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