AT90USB646 datasheet(83/459 Pages) ATMEL

83 / 459 page

7593H–AVR–11/08

ATmega32U6/AT90USB64/128

10.3.4

Alternate Functions of Port C

The Port C alternate function is as follows:

Table 10-10 and Table 10-11 relate the alternate functions of Port C to the overriding signals

shown in Figure 10-5 on page 77.

Table 10-9.

Port C Pins Alternate Functions

Port Pin

Alternate Function

PC7

A15/IC.3/CLKO(External Memory interface address bit 15 or

Input Capture Timer 3 or CLKO (Divided System Clock)

PC6

A14/OC.3A(External Memory interface address bit 14 or

Output Compare and PWM output A for Timer/Counter3)

PC5

A13/OC.3B(External Memory interface address bit 13 or

Output Compare and PWM output B for Timer/Counter3)

PC4

A12/OC.3C(External Memory interface address bit 12 or

Output Compare and PWM output C for Timer/Counter3)

PC3

A11/T.3(External Memory interface address bit 11or

Timer/Counter3 Clok Input)

PC2

A10(External Memory interface address bit 10)

PC1

A9(External Memory interface address bit 9)

PC0

A8(External Memory interface address bit 8)

Table 10-10. Overriding Signals for Alternate Functions in PC7..PC4

Signal

Name

PC7/A15/IC.3/CLK

PC6/A14/OC.3A

PC5/A13/OC.3B

PC4/A12/OC.3C

PUOE

SRE • (XMM<1)

SRE •

(XMM<2)|OC3A

enable

SRE •

(XMM<3)|OC3B

enable

SRE •

(XMM<4)|OC3C

enable

PUOV

DDOE

SRE • (XMM<1)

SRE • (XMM<2)

SRE • (XMM<3)

SRE • (XMM<4)

DDOV

PVOE

SRE • (XMM<1)

SRE • (XMM<2)

SRE • (XMM<3)

SRE • (XMM<4)

PVOV

A15

if (SRE.XMM<2)

then A14

else OC3A

if (SRE.XMM<2)

then A13

else OC3B

if (SRE.XMM<2)

then A12

else OC3C

DIEOE

DIEOV

ICP3 input

–

AIO

–

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