10.3.4
Alternate Functions of Port C
The Port C alternate function is as follows:
Table 10-9. Port C Pins Alternate Functions
Port Pin
Alternate Function
A15/IC.3/CLKO(External Memory interface address bit 15 or
Input Capture Timer 3 or CLK0 (Divided System Clock)
PC7
A14/OC.3A(External Memory interface address bit 14 or
Output Compare and PWM output A for Timer/Counter3)
PC6
PC5
PC4
PC3
A13/OC.3B(External Memory interface address bit 13 or
Output Compare and PWM output B for Timer/Counter3)
A12/OC.3C(External Memory interface address bit 12 or
Output Compare and PWM output C for Timer/Counter3)
A11/T.3(External Memory interface address bit 11or
Timer/Counter3 Clok Input)
PC2
PC1
PC0
A10(External Memory interface address bit 10)
A9(External Memory interface address bit 9)
A8(External Memory interface address bit 8)
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 78.
Table 10-10. Overriding Signals for Alternate Functions in PC7..PC4
Signal
Name
PC7/A15/IC.3/CLK
O
PC6/A14/OC.3A
PC5/A13/OC.3B
PC4/A12/OC.3C
SRE •
SRE •
SRE •
PUOE
SRE • (XMM<1)
(XMM<2)|OC3A
enable
(XMM<3)|OC3B
enable
(XMM<4)|OC3C
enable
PUOV
DDOE
DDOV
PVOE
0
0
0
0
SRE • (XMM<1)
1
SRE • (XMM<2)
1
SRE • (XMM<3)
1
SRE • (XMM<4)
1
SRE • (XMM<1)
SRE • (XMM<2)
SRE • (XMM<3)
SRE • (XMM<4)
if (SRE.XMM<2)
then A14
if (SRE.XMM<2)
then A13
if (SRE.XMM<2)
then A12
PVOV
A15
else OC3A
else OC3B
else OC3C
DIEOE
DIEOV
DI
0
0
0
–
–
0
0
–
–
0
0
–
–
0
ICP3 input
–
AIO
84
AT90USB64/128
7593A–AVR–02/06
ATMEL [ ATMEL ]
