AT90PWM81-16MF Atmel, AT90PWM81-16MF Datasheet - Page 131

• 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

12.22 PSC Synchronization
12.22.1
7734P–AVR–08/10
Fault events in Autorun mode
Note : In AT90PWM81, this feature is not relevant and PRUN2, PARUN2 are stuck at zero.
2 or 3 PSC can be synchronized together. In this case, two waveform alignments are possible:
Figure 12-41. PSC Run Synchronization
If the PSCm has its PARUNn bit set, then it can start at the same time than PSCn-1.
PRUNn and PARUNn bits are located in PCTLn register.
139.
Note : Do not set the PARUNn bits on the three PSC at the same time.
Thanks to this feature, we can for example configure two PSC in slave mode (PARUNn = 1 / PRUNn = 0)
and one PSC in master mode (PARUNm = 0 / PRUNm = 0). This PSC master can start all PSC at the
same moment ( PRUNm = 1).
To complete this master/slave mechanism, fault event (input mode 7) is propagated from PSCn-1 to PSCn
and from PSCn to PSCn-1.
A PSC which propagate a Run signal to the following PSC stops this PSC when the Run signal is
deactivate.
• The waveforms are center aligned in the Center Aligned mode if master and slaves are all with the
• The waveforms are edge aligned in the 1, 2 or 4 ramp mode
same PSC period (which is the natural use).
PRUN0
PARUN0
PRUN1
PARUN1
PRUN2
PARUN2
SY0In
SY1In
SY2In
SY0Out
SY1Out
SY2Out
Run PSC0
Run PSC1
Run PSC2
See “PSC 2 Control Register – PCTL2” on page
PSC0
PSC1
PSC2
AT90PWM81
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