ATmega128(L)
Alternate Functions of In ATmega103 compatibility mode, Port C is output only. The ATmega128 is by default shipped
Port C
in compatibility mode. Thus, if the parts are not programmed before they are put on the PCB,
PORTC will be output during first power up, and until the ATmega103 compatibility mode is dis-
abled. The Port C has an alternate function as the address high byte for the External Memory
Interface.
Table 33. Port C Pins Alternate Functions
Port Pin
PC7
Alternate Function
A15
A14
A13
A12
A11
A10
A9
PC6
PC5
PC4
PC3
PC2
PC1
PC0
A8
Table 34 and Table 35 relate the alternate functions of Port C to the overriding signals shown in
Figure 33 on page 71.
Table 34. Overriding Signals for Alternate Functions in PC7..PC4
Signal
Name
PUOE
PUOV
DDOE
DDOV
PVOE
PVOV
DIEOE
DIEOV
DI
PC7/A15
PC6/A14
PC5/A13
PC4/A12
SRE • (XMM(1)<1)
SRE • (XMM<2)
SRE • (XMM<3)
SRE • (XMM<4)
0
0
0
0
SRE • (XMM<1)
SRE • (XMM<2)
SRE • (XMM<3)
SRE • (XMM<4)
1
1
1
1
SRE • (XMM<1)
SRE • (XMM<2)
SRE • (XMM<3)
SRE • (XMM<4)
A15
0
A14
0
A13
0
A12
0
0
0
0
0
–
–
–
–
AIO
–
–
–
–
Note:
1. XMM = 0 in ATmega103 compatibility mode.
77
2467P–AVR–08/07
ATMEL [ ATMEL ]
