AT90PWM2B-16SU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT90PWM2B-16SU

8-bit Atmel Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

AT90PWM2/3/2B/3B

• Bit 7:6 – PPRE01:0 : PSC 0 Prescaler Select

This two bits select the PSC input clock division factor. All generated waveform will be modified

by this factor.

Table 16-14. PSC 0 Prescaler Selection

PPRE01

PPRE00

Description PWM2/3

0

0

No divider on PSC input clock

0

1

Divide the PSC input clock by 4

1

0

Divide the PSC input clock by 16

1

1

Divide the PSC clock by 64

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

• Bit 5 – PBFM0 : 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 – PAOC0B : PSC 0 Asynchronous Output Control B

When this bit is set, Fault input selected to block B can act directly to PSCOUT01 output. See

Section “PSC Input Configuration”, page 148.

• Bit 3 – PAOC0A : PSC 0 Asynchronous Output Control A

When this bit is set, Fault input selected to block A can act directly to PSCOUT00 output. See

Section “PSC Input Configuration”, page 148.

• Bit 2 – PARUN0 : PSC 0 Autorun

When this bit is set, the PSC 0 starts with PSC2. That means that PSC 0 starts :

• when PRUN2 bit in PCTL2 is set,

• or when PARUN2 bit in PCTL2 is set and PRUN1 bit in PCTL1 register is set.

Thanks to this bit, 2 or 3 PSCs can be synchronized (motor control for example)

• Bit 1 – PCCYC0 : PSC 0 Complete Cycle

When this bit is set, the PSC 0 completes the entire waveform cycle before halt operation

requested by clearing PRUN0. This bit is not relevant in slave mode (PARUN0 = 1).

• Bit 0 – PRUN0 : PSC 0 Run

Writing this bit to one starts the PSC 0.

When set, this bit prevails over PARUN0 bit.

16.25.12 PSC 1 Control Register – PCTL1

Bit

Read/Write

Initial Value

7

PPRE11

R/W

0

6

PPRE10

R/W

0

5

PBFM1

R/W

0

4

PAOC1B

R/W

0

3

PAOC1A

R/W

0

2

PARUN1

R/W

0

1

PCCYC1

R/W

0

0

PRUN1

R/W

0

PCTL1

4317K–AVR–03/2013

167

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