AT90USB1287_14 Datasheet, PDF (82/456 Pages) ATMEL Corporation – Non-volatile program and data memories

11.3.4
Alternate functions of Port C
The Port C alternate function is as follows:
Table 11-9. 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 11-10 and Table 11-11 on page 83 relate the alternate functions of Port C to the overriding
signals shown in Figure 11-5 on page 76.
Table 11-10. Overriding signals for alternate functions in PC7..PC4.
Signal
name
PC7/A15/IC.3/CLKO
PC6/A14/OC.3A
PC5/A13/OC.3B
PUOE SRE • (XMM<1)
SRE •
(XMM<2)|OC3A
enable
SRE •
(XMM<3)|OC3B
enable
PUOV 0
0
0
DDOE SRE • (XMM<1)
SRE • (XMM<2)
SRE • (XMM<3)
DDOV 1
1
1
PVOE SRE • (XMM<1)
SRE • (XMM<2)
SRE • (XMM<3)
PVOV A15
if (SRE.XMM<2)
then A14
else OC3A
if (SRE.XMM<2)
then A13
else OC3B
DIEOE 0
0
0
DIEOV 0
0
0
DI
ICP3 input
–
–
AIO
–
–
–
PC4/A12/OC.3C
SRE •
(XMM<4)|OC3C
enable
0
SRE • (XMM<4)
1
SRE • (XMM<4)
if (SRE.XMM<2)
then A12
else OC3C
0
0
–
–
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