TC4 Control Register C
Name:
TCCR4C
Offset:
0xA2
Reset:
0x00
Access:
-
Bit76543210
FOC4AFOC4B
AccessR/WR/W
Reset00

Bits 6, 7 – FOC4B, FOC4A: Force Output Compare for Channel B and A

Force Output Compare for Channel B and A

The FOCA/FOCB bits are only active when the WGM4[3:0] bits specifies a non-PWM mode. When writing a logical one to the FOC4A/FOC4B bit, an immediate compare match is forced on the Waveform Generation unit. The OC4A/OC4B output is changed according to its COM4x[1:0] bits setting. Note that the FOCA/FOCB bits are implemented as strobes. Therefore it is the value present in the COM4x[1:0] bits that determine the effect of the forced compare.

A FOC4A/FOC4B strobe will not generate any interrupt nor will it clear the timer in Clear Timer on Compare match (CTC) mode using OCR4A as TOP. The FOC4A/FOC4B bits are always read as zero.