AT90PWM81 Atmel Corporation, AT90PWM81 Datasheet - Page 132
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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12.23 PSC Clock Sources
12.24 Interrupts
132
AT90PWM81
According to the architecture of the PSC synchronization which build a “daisy-chain on the PSC run sig-
nal” between the three PSC, only the fault event (mode 7) which is able to “stop” the PSC through the
PRUN bits is transmitted along this daisy-chain.
A PSC which receive its Run signal from the previous PSC transmits its fault signal (if enabled) to this
previous PSC. So a slave PSC propagates its fault events when they are configured and enabled.
PSC must be able to generate high frequency with enhanced resolution.
Each PSC has two clock inputs:
Figure 12-42. Clock selection
PCLKSELn bit in PSC n Configuration register (PCNFn) is used to select the clock source.
PPREn1/0 bits in PSC n Control Register (PCTLn) are used to select the divide factor of the clock.
Table 12-10.
This section describes the specifics of the interrupt handling as performed in AT90PWM81.
PCLKSELn
0
0
0
0
1
1
1
1
• CLK PLL from the PLL
• CLK I/O
CLK
CLK
PLL
I/O
Output Clock versus Selection and Prescaler
PCLKSELn
PPREn1
0
0
1
1
0
0
1
1
1
0
CK
PPREn0
0
1
0
1
0
1
0
1
PRESCALER
CLK
CLKPSCn output
CLK I/O
CLK I/O / 4
CLK I/O / 32
CLK I/O / 256
CLK PLL
CLK PLL / 4
CLK PLL / 32
CLK PLL / 256
PSCn
PPREn1/0
7734P–AVR–08/10
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