AT90PWM81 Atmel Corporation, AT90PWM81 Datasheet - Page 156

• Manufacturer Part Number: AT90PWM81
• Manufacturer: Atmel Corporation

Specifications of AT90PWM81

• Flash (kbytes): 8 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 20
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 3
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.25
• Eeprom (bytes): 512
• 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: 1
• Output Compare Channels: 8
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

13.8.1
13.8.2
156
AT90PWM81
PSCR Retrigger Behavior versus PSCR running modes
Retrigger PSCOUTr0 On External Event
Figure 13-8.
In two ramp or four ramp mode, Retrigger Inputs A or B cause the end of the corresponding cycle A or B
and the beginning of the following cycle B or A.
In one ramp mode, Retrigger Inputs A or B reset the current PSCR counting to zero.
PSCOUTr0 output can be reset before end of On-Time 0 on the change on PSCr Input A. PSCr Input A
can be configured to do not act or to act on level or edge modes. The polarity of PSCr Input A is configu-
rable thanks to a sense control block. PSCr Input A can be the Output of the analog comparator or the
PSCINr input.
As the period of the cycle decreases, the instantaneous frequency of the two outputs increases.
PSCINr
AC1 O: Analog
Comparator
Output
PSCINrA
PSCINrB
PISELrA1
(PISELrB1)
0
0
1
1
PSCR Input Module
0
1
0
1
PISELrA0
(PISELrB0)
PSCR Input A
(PSCR Input B)
PELE V rA /
(PELE V rB )
PRFM rA3:0
(PRFM rB3:0)
PCAErA
(PCAErB)
Digital
Filter
CLK
PSC
PAO CrA
(PA OCrB)
PFLTErA
(PFLTErB)
0
1
CLK
CLK
2
4
PSC
PSC
Input
Processing
(retriggering ...)
PSC C o re
(Counter,
Waveform
Generator, ...)
Output
Control
PSCOUT r0
(PSCOUT r1)
7734P–AVR–08/10