ATEMGA128-16AI View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'ATEMGA128-16AI' PDF : 395 Pages View PDF
Alternate Functions of Port C
In ATmega103 compatibility mode, Port C is output only. The ATmega128 is by default
shipped 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 disabled. 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
Alternate Function
PC7
A15
PC6
A14
PC5
A13
PC4
A12
PC3
A11
PC2
A10
PC1
A9
PC0
A8
Table 34 and Table 35 relate the alternate functions of Port C to the overriding signals
shown in Figure 33 on page 70.
Table 34. Overriding Signals for Alternate Functions in PC7..PC4
Signal
Name
PUOE
PC7/A15
SRE • (XMM(1)<1)
PC6/A14
SRE • (XMM<2)
PC5/A13
SRE • (XMM<3)
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 A11
A10
A9
DIEOE 0
0
0
DIEOV 0
0
0
DI
–
–
–
AIO
–
–
–
Note: 1. XMM = 0 in ATmega103 compatibility mode.
PC4/A12
SRE • (XMM<4)
0
SRE • (XMM<4)
1
SRE • (XMM<4)
A8
0
0
–
–
76 ATmega128
2467O–AVR–10/06
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