ATMEGA8L-8AI Atmel, ATMEGA8L-8AI Datasheet - Page 186

• Manufacturer Part Number: ATMEGA8L-8AI
• Description: IC AVR MCU 8K LV 8MHZ IND 32TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8L-8AI

• 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: 23
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K 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: 32-TQFP, 32-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: ATMEGA8L8AI

Analog
Comparator
Special Function IO
Register – SFIOR
Analog Comparator
Control and Status
Register – ACSR
186
ATmega8(L)
The Analog Comparator compares the input values on the positive pin AIN0 and negative 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 com-
parator output rise, fall or toggle. A block diagram of the comparator and its surrounding logic is
shown in
Figure 89. 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 Comparator. For a detailed
description of this bit, see
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
ADC MULTIPLEXER
REFERENCE
ACME
ADEN
BANDGAP
1. See
2. Refer to
Figure
OUTPUT
placement
R
7
–
0
ACD
R/W
Table 72 on page 188
7
0
89.
ACBG
(1)
“Pin Configurations” on page 2
ACBG
R/W
R
6
–
0
6
0
“Analog Comparator Multiplexed Input” on page
ACO
N/A
R
R
5
5
–
0
R/W
ACI
4
0
R
4
–
0
(2)
ACIE
R/W
and
ACME
3
0
R/W
3
0
Table 28 on page 63
ACIC
R/W
2
0
PUD
R/W
2
0
ACIS1
R/W
PSR2
1
0
R/W
1
0
ACIS0
for Analog Comparator pin
PSR10
R/W
R/W
0
0
0
0
188.
ACSR
SFIOR
2486Z–AVR–02/11