AT90PWM2B-16SE ATMEL [ATMEL Corporation], AT90PWM2B-16SE Datasheet - Page 166

• Manufacturer Part Number: AT90PWM2B-16SE
• Description: 8-bit Microcontroller with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

16.25.13 PSC 2 Control Register – PCTL2
166
AT90PWM2/3/2B/3B
• Bit 7:6 – PPRE11:0 : PSC 1 Prescaler Select
This two bits select the PSC input clock division factor.All generated waveform will be modified
by this factor.
Table 16-15. PSC 1 Prescaler Selection
• Bit 5 – PBFM1 : Balance Flank Width Modulation
When this bit is clear, Flank Width Modulation operates on On-Time 1 only.
When this bit is set, Flank Width Modulation operates on On-Time 0 and On-Time 1.
• Bit 4 – PAOC1B : PSC 1 Asynchronous Output Control B
When this bit is set, Fault input selected to block B can act directly to PSCOUT11 output. See
Section “PSC Clock Sources”, page 159
• Bit 3 – PAOC1A : PSC 1 Asynchronous Output Control A
When this bit is set, Fault input selected to block A can act directly to PSCOUT10 output. See
Section “PSC Clock Sources”, page 159
• Bit 2 – PARUN1 : PSC 1 Autorun
When this bit is set, the PSC 1 starts with PSC0. That means that PSC 1 starts :
•
•
Thanks to this bit, 2 or 3 PSCs can be synchronized (motor control for example)
• Bit 1 – PCCYC1 : PSC 1 Complete Cycle
When this bit is set, the PSC 1 completes the entire waveform cycle before halt operation
requested by clearing PRUN1. This bit is not relevant in slave mode (PARUN1 = 1).
• Bit 0 – PRUN1 : PSC 1 Run
Writing this bit to one starts the PSC 1.
When set, this bit prevails over PARUN1 bit.
Bit
Read/Write
Initial Value
PPRE11
0
0
1
1
when PRUN0 bit in PCTL0 register is set,
or when PARUN0 bit in PCTL0 is set and PRUN2 bit in PCTL2 register is set.
PPRE10
0
1
0
1
PPRE21
R/W
7
0
PPRE20
R/W
6
0
Description PWM2/3
No divider on PSC input clock
Divide the PSC input clock by 4
Divide the PSC input clock by 16
Divide the PSC clock by 64
PBFM2
R/W
5
0
PAOC2B
R/W
4
0
PAOC2A
R/W
3
0
PARUN2
R/W
2
0
Description PWM2B/3B
No divider on PSC input clock
Divide the PSC input clock by 4
Divide the PSC input clock by 32
Divide the PSC clock by 256
PCCYC2
R/W
1
0
PRUN2
R/W
0
0
4317J–AVR–08/10
PCTL2