Datasheet

77
ATmega16U4/32U4 [DATASHEET]
Atmel-7766J-USB-ATmega16U4/32U4-Datasheet_04/2016
10.3.2 Alternate Functions of Port C
The Port C pins with alternate functions are shown below.
• ICP3/CLKO/OC.4A – Port C, Bit 7
ICP3: If Timer 3 is correctly configured, this pin can serve as Input Capture feature.
CLKO: When the corresponding fuse is enabled, this pin outputs the internal microcontroller working frequency.
If the clock prescaler is used, this will affect this output frequency.
OC.4A: Timer 4 Output Compare A. This pin can be used to generate a high-speed PWM signal from Timer 4
module. The pin has to be configured as an output (DDC7 set “one”) to serve this function.
• OC.3A/OC.4A – Port C, Bit 6
OC.3A: Timer 3 Output Compare A. This pin can be used to generate a PWM signal from Timer 3 module.
OC.4A
: Timer 4 Output Compare A. This pin can be used to generate a high-speed PWM signal from Timer 4
module, complementary to OC.4A (PC7) signal. The pin has to be configured as an output (DDC6 set “one”) to
serve this function.
Table 10-6. Port C Pins Alternate Functions
Port Pin Alternate Function
PC7
ICP3/CLKO/OC4A(Input Capture Timer 3 or CLK0 (Divided System
Clock) or Output Compare and direct PWM output A for Timer 4)
PC6
OC.3A/OC4A (Output Compare and PWM output A for Timer/Counter3
or Output Compare and complementary PWM output A
for Timer 4)
PC5
Not present on pin-out.
PC4
PC3
PC2
PC1
PC0