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 – 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

PPRE11

PPRE10

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 – 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 161

• 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 161

• Bit 2 – PARUN1 : PSC 1 Autorun

When this bit is set, the PSC 1 starts with PSC0. That means that PSC 1 starts :

• when PRUN0 bit in PCTL0 register is set,

• or when PARUN0 bit in PCTL0 is set and PRUN2 bit in PCTL2 register is set.

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.

16.25.13 PSC 2 Control Register – PCTL2

Bit

Read/Write

Initial Value

7

PPRE21

R/W

0

6

PPRE20

R/W

0

5

PBFM2

R/W

0

4

PAOC2B

R/W

0

3

PAOC2A

R/W

0

2

PARUN2

R/W

0

1

PCCYC2

R/W

0

0

PRUN2

R/W

0

PCTL2

4317K–AVR–03/2013

168

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