AT90CAN32 Automotive Atmel Corporation, AT90CAN32 Automotive Datasheet - Page 268

• Manufacturer Part Number: AT90CAN32 Automotive
• Manufacturer: Atmel Corporation

Specifications of AT90CAN32 Automotive

• Flash (kbytes): 32 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 53
• Ext Interrupts: 8
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 2
• Can: 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): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 125
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 8
• Input Capture Channels: 2
• Pwm Channels: 7
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

20. Analog Comparator
20.1
20.2
20.2.1
268
Overview
Analog Comparator Register Description
AT90CAN32/64/128
ADC Control and Status Register B – ADCSRB
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 inter-
rupt, exclusive to the Analog Comparator. The user can select Interrupt triggering on comparator
output rise, fall or toggle. A block diagram of the comparator and its surrounding logic is shown
in
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
Read/Write
Initial Value
Figure
MULTIPLEXER
REFERENCE
ACME
ADEN
OUTPUT
BANDGAP
ADC
1. ADC multiplexer output: see
2. Refer to
20-1.
placement.
ACBG
R
7
0
-
Figure 1-2 on page 5
ACME
R/W
6
0
“Analog Comparator Multiplexed Input” on page
R
5
–
0
Table 20-2 on page
and
R
4
–
0
Table 9-15 on page 83
R
3
–
0
(1)(2)
ADTS2
270.
R/W
2
0
for Analog Comparator pin
ADTS1
R/W
1
0
ADTS0
R/W
0
0
270.
T/C1 INPUT CAPTURE
ADCSRB
7682C–AUTO–04/08