ATmega16U4 datasheet(169/408 Pages) ATMEL

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169

7766D–AVR–01/09

ATmega16U4/ATmega32U4

• Bit 1 - FOC4D: Force Output Compare Match 4D

The FOC4D bit is only active when the PWM4D bit specify a non-PWM mode.

Writing a logical one to this bit forces a change in the Waveform Output (OCW4D) and the Out-

put Compare pin (OC4D) according to the values already set in COM4D1 and COM4D0. If

COM4D1 and COM4D0 written in the same cycle as FOC4D, the new settings will be used. The

Force Output Compare bit can be used to change the output pin value regardless of the timer

value. The automatic action programmed in COM4D1 and COM4D0 takes place as if a compare

match had occurred, but no interrupt is generated. The FOC4D bit is always read as zero.

• Bit 0 - PWM4D: Pulse Width Modulator D Enable

When set (one) this bit enables PWM mode based on comparator OCR4D.

15.12.4

TCCR4D – Timer/Counter4 Control Register D

• Bit 7 - FPIE4: Fault Protection Interrupt Enable

Setting this bit (to one) enables the Fault Protection Interrupt.

• Bit 6– FPEN4: Fault Protection Mode Enable

Setting this bit (to one) activates the Fault Protection Mode.

• Bit 5 – FPNC4: Fault Protection Noise Canceler

Setting this bit activates the Fault Protection Noise Canceler. When the noise canceler is acti-

vated, the input from the Fault Protection Pin (INT0) is filtered. The filter function requires four

successive equal valued samples of the INT0 pin for changing its output. The Fault Protection is

therefore delayed by four Oscillator cycles when the noise canceler is enabled.

• Bit 4 – FPES4: Fault Protection Edge Select

This bit selects which edge on the Fault Protection pin (INT0) is used to trigger a fault event.

When the FPES4 bit is written to zero, a falling (negative) edge is used as trigger, and when the

FPES4 bit is written to one, a rising (positive) edge will trigger the fault.

Table 15-18. Compare Output Mode, Phase and Frequency Correct PWM Mode

COM4D1..0

OCW4D Behavior

OC4D Pin

Normal port operation.

Disconnected

Cleared on Compare Match when up-counting.

Set on Compare Match when down-counting.

Connected

Cleared on Compare Match when up-counting.

Set on Compare Match when down-counting.

Connected

Disconnected

Set on Compare Match when up-counting.

Cleared on Compare Match when down-counting.

Connected

Disconnected

Bit

76543210

FPIE4

FPEN4

FPNC4

FPES4

FPAC4

FPF4

WGM41

WGM40

TCCR4D

Read/Write

R/W

Initial value

00000000

ATmega16U4 Datasheet(PDF) 169 Page - ATMEL Corporation

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