AT90PWM81 Atmel Corporation, AT90PWM81 Datasheet - Page 154
AT90PWM81
Manufacturer Part Number
AT90PWM81
Description
Manufacturer
Atmel Corporation
Datasheet
1.AT90PWM161.pdf
(325 pages)
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
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13.5.3
13.6
154
Update of Values
AT90PWM81
Fifty Percent Waveform Configuration
Figure 13-6.
On-Time 0 = (OCRrRAH/L - OCRrSAH/L) * 1/Fclkpsc
On-Time 1 = (OCRrRBH/L - OCRrSBH/L) * 1/Fclkpsc
Dead-Time 0 = (OCRrSAH/L + 1) * 1/Fclkpsc
Dead-Time 1 = (OCRrSBH/L - OCRrRAH/L) * 1/Fclkpsc
Note:
When PSCOUTr0 and PSCOUTr1 have the same characteristics, it’s possible to configure the PSCR in a
Fifty Percent mode. When the PSCR is in this configuration, it duplicates the OCRrSBH/L and OCR-
rRBH/L registers in OCRrSAH/L and OCRrRAH/L registers. So it is not necessary to program
OCRrSAH/L and OCRrRAH/L registers.
The update of PSCR waveform registers are done in the following way:
•
•
•
To avoid asynchronous and incoherent values in a cycle, if an update of one of several values is necessary,
all values are updated at the same time at the end of the cycle by the PSC. The new set of values is calcu-
lated by software and the update is initiated by software.
PSC Counter
PSCOUTn0
PSCOUTn1
Immediately when the PSC is stopped
At the PSC end of cycle when the PSC is running
At the PSC end of cycle following the required condition when LOCK or AUTOLOCK modes are
used.
Minimal value for Dead-Time 0 = 1/Fclkpsc
OCRnSA
0
PSCr0 & PSCr1 Basic Waveforms in One Ramp mode
Dead-Time 0
On-Time 0
PSC Cycle
OCRnRA
OCRnSB
Dead-Time 1
On-Time 1
OCRnRB
7734P–AVR–08/10
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