AT90PWM2B Atmel Corporation, AT90PWM2B Datasheet - Page 230

• Manufacturer Part Number: AT90PWM2B
• Manufacturer: Atmel Corporation

Specifications of AT90PWM2B

• Flash (kbytes): 8 Kbytes
• Pin Count: 24
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 19
• Ext Interrupts: 4
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 2
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 105
• 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: 12
• Input Capture Channels: 1
• Pwm Channels: 7
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

20.2.4
230
AT90PWM2/3/2B/3B
Analog Comparator Status Register – ACSR
• Bit 6– AC2IE: Analog Comparator 2 Interrupt Enable bit
Set this bit to enable the analog comparator 2 interrupt.
Clear this bit to disable the analog comparator 2 interrupt.
• Bit 5, 4– AC2IS1, AC2IS0: Analog Comparator 2 Interrupt Select bit
These 2 bits determine the sensitivity of the interrupt trigger.
The different setting are shown in
Table 20-5.
• Bit 2, 1, 0– AC2M2, AC2M1, AC2M0: Analog Comparator 2 Multiplexer register
These 3 bits determine the input of the negative input of the analog comparator.
The different setting are shown in
Table 20-6.
Bit
Read/Write
Initial Value
• Bit 7– ACCKDIV: Analog Comparator Clock Divider
The analog comparators can work with a clock up to 8MHz@3V and 16MHz@5V.
Set this bit in case the clock frequency of the microcontroller is higher than 8 MHz to insert a
divider by 2 between the clock of the microcontroller and the clock of the analog comparators.
Clear this bit to have the same clock frequency for the microcontroller and the analog
comparators.
• Bit 6– AC2IF: Analog Comparator 2 Interrupt Flag Bit
This bit is set by hardware when comparator 2 output event triggers off the interrupt mode
defined by AC2IS1 and AC2IS0 bits in AC2CON register.
This bit is cleared by hardware when the corresponding interrupt vector is executed in case the
AC2IS1
0
0
1
1
AC2M2
0
0
0
0
1
1
1
1
Interrupt sensitivity selection
Analog Comparator 2 negative input selection
ACCKDIV
AC2IS0
0
1
0
1
AC2M1
0
0
1
1
0
0
1
1
R/W
7
0
AC2IF
R/W
6
0
Description
Comparator Interrupt on output toggle
Reserved
Comparator interrupt on output falling edge
Comparator interrupt on output rising edge
AC2M0
0
1
0
1
0
1
0
1
AC1IF
Table
Table
R/W
5
0
20-1.
20-6.
Description
“Vref”/6.40
“Vref”/3.20
“Vref”/2.13
“Vref”/1.60
Analog Comparator Negative Input (ACMPM pin)
DAC result
Reserved
Reserved
AC0IF
R/W
4
0
3
0
-
-
AC2O
R
2
0
AC1O
R
1
0
AC0O
R
0
0
4317J–AVR–08/10
ACSR