AT90PWM81-16MF Atmel, AT90PWM81-16MF Datasheet - Page 132

• Manufacturer Part Number: AT90PWM81-16MF
• Description: IC MCU AVR 8K FLASH ISP 32QFN
• Manufacturer: Atmel
• Series: AVR® 90PWM Lightingr

Specifications of AT90PWM81-16MF

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI
• Peripherals: Brown-out Detect/Reset, PWM, WDT
• Number Of I /o: 20
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 11x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 32-MLF®, QFN
• For Use With: ATSTK600-SOIC - STK600 SOCKET/ADAPTER FOR SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
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