at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 170

• Manufacturer Part Number: at90pwm81-16se
• Description: 8-bit Avr Microcontroller With 8k Bytes In- System Programmable Flash
• Manufacturer: ATMEL Corporation

14.20 Interrupt Handling
14.21 PSC Clock Sources
170
AT90PWM81
This signal can be selected between all falling or rising edge of PSCr0 or PSCr1 outputs.
List of interrupt sources:
PSCR must be able to generate high frequency with enhanced resolution.
The PSCR has two clock inputs:
Figure 14-31. Clock selection
PCLKSELr bit in PSCR Configuration register (PCNFr) is used to select the clock source.
PPREr1/0 bits in PSCR Control Register (PCTLr) are used to select the divide factor of the clock.
Table 14-7.
PCLKSELr
0
0
0
0
1
1
1
1
• Counter reload (end of On Time 1)
• PSCR Input event (active edge or at the beginning of level configured event)
• CLK PLL from the PLL
• CLK I/O
CLK
CLK
PLL
I/O
Output Clock versus Selection and Prescaler
PPREr1
0
0
1
1
0
0
1
1
PCLKSELr
1
0
CK
PPREr0
0
1
0
1
0
1
0
1
PRESCALER
CLK
CLKPSCr 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
PSCr
PPREr1/0
7734M–AVR–03/10