at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 140

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

13.25.10
13.25.11
140
AT90PWM81
PSC n Input A Control Register – PFRCnA
PSC n Input B Control Register – PFRCnB
Table 13-20.
• Bit 5 – PBFMn0 : Balance Flank Width Modulation bit 0
Defines the Flank Width Modulation, together with PBFMn1 bit in PCNFEn register.
See
• Bit 4 – PAOCnB : PSC n Asynchronous Output Control B
When this bit is set, Fault input selected to block B can act directly to PSCOUTn1 and PSCOUT23 out-
puts. See Section “PSC Clock Sources”, page 132.
• Bit 3 – PAOCnA : PSC n Asynchronous Output Control A
When this bit is set, Fault input selected to block A can act directly to PSCOUTn0 and PSCOUT22 out-
puts. See Section “PSC Clock Sources”, page 132.
• Bit 2 – PARUNn : PSC n Autorun
When this bit is set, the PSC n starts with PSCn-1. That means that PSC n starts :
• Bit 1 – PCCYCn : PSC n Complete Cycle
When this bit is set, the PSC n completes the entire waveform cycle before halt operation requested by
clearing PRUNn. This bit is not relevant in slave mode (PARUNn = 1).
• Bit 0 – PRUNn : PSC n Run
Writing this bit to one starts the PSC n.
When set, this bit prevails over PARUNn bit.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
PPREn1
0
1
1
• when PRUNn bit in PCTLn register is set,
• or when PARUNn bit in PCTLn is set and PRUNn-1 bit in PCTLn-1 register is set (or PARUN0 bit
and PRUN0).
Table 13-15 on page 137
7
PCAEnA
R/W
0
7
PCAEnB
R/W
0
PSC n Prescaler Selection
PPREn0
1
0
1
6
PISELnA0 PELEVnA0 PFLTEnA
R/W
0
6
PISELnB0 PELEVnB0 PFLTEnB
R/W
0
Description
Divide the PSC input clock by 4
Divide the PSC input clock by 16
Divide the PSC clock by 64
5
R/W
0
5
R/W
0
4
R/W
0
4
R/W
0
3
PRFMnA3 PRFMnA2 PRFMnA1 PRFMnA0 PFRCnA
R/W
0
3
PRFMnB3 PRFMnB2 PRFMnB1 PRFMnB0 PFRCnB
R/W
0
2
R/W
0
2
R/W
0
1
R/W
0
1
R/W
0
0
R/W
0
0
R/W
0
7734M–AVR–03/10