ATmega128 datasheet(77/386 Pages) ATMEL

tên linh kiện	ATmega128

Giải thích chi tiết về linh kiện	8-bit Microcontroller with 128K Bytes In-System Programmable Flash

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77 / 386 page

2467S–AVR–07/09

ATmega128

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 dis-

abled. The Port C has an alternate function as the address high byte for the External Memory

Interface.

Table 34 and Table 35 relate the alternate functions of Port C to the overriding signals shown in

Figure 33 on page 71.

Note:

1. XMM = 0 in ATmega103 compatibility mode.

Table 33. Port C Pins Alternate Functions

Port Pin

Alternate Function

PC7

A15

PC6

A14

PC5

A13

PC4

A12

PC3

A11

PC2

A10

PC1

PC0

Table 34. Overriding Signals for Alternate Functions in PC7..PC4

Signal

Name

PC7/A15

PC6/A14

PC5/A13

PC4/A12

PUOE

SRE • (XMM(1)<1)

SRE • (XMM<2)

SRE • (XMM<3)

SRE • (XMM<4)

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

A14

A13

A12

DIEOE

DIEOV

–

AIO

–

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