ATmega168 Automotive Atmel Corporation, ATmega168 Automotive Datasheet - Page 234

• Manufacturer Part Number: ATmega168 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATmega168 Automotive

• Flash (kbytes): 16 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 23
• Ext Interrupts: 24
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 1
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 150
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 6
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

20.0.1
20.0.2
234
ATmega48/88/168 Automotive
ADC Control and Status Register B – ADCSRB
Analog Comparator Control and Status Register – ACSR
Figure 20-1. Analog Comparator Block Diagram
Notes:
• Bit 6 – 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 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 Comparator Interrupt must be
disabled by clearing the ACIE bit in ACSR. Otherwise an interrupt can occur when the bit is
changed.
• Bit 6 – ACBG: Analog Comparator Bandgap Select
When this bit is set, a fixed bandgap reference voltage replaces the positive input to the Analog
Comparator. When this bit is cleared, AIN0 is applied to the positive input of the Analog Compar-
ator.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
See “Internal Voltage Reference” on page 46.
ADC MULTIPLEXER
1. See
2. Refer to
REFERENCE
ACME
ADEN
BANDGAP
OUTPUT
placement.
Table 20-2 on page
(1)
ACD
R/W
7
0
R
7
–
0
ACBG
Figure 1-1 on page 2
ACBG
ACME
R/W
R/W
“Analog Comparator Multiplexed Input” on page
6
0
6
0
236.
ACO
N/A
R
5
R
5
–
0
and
Table 10-9 on page 77
R/W
ACI
4
0
R
4
–
0
(2)
ACIE
R/W
R
3
0
3
–
0
ADTS2
ACIC
R/W
R/W
2
0
2
0
for Analog Comparator pin
ADTS1
ACIS1
R/W
R/W
1
0
1
0
236.
ADTS0
ACIS0
R/W
R/W
0
0
0
0
7530I–AVR–02/10
ADCSRB
ACSR