ATMEGA64-16MI 查看數據表（PDF） - Atmel Corporation

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ATMEGA64-16MI

8-bit AVR® Microcontroller with 64K Bytes In-System Programmable Flash

Atmel Corporation 

ATmega64(L)

Alternate Functions of Port A The Port A has an alternate function as the address low byte and data lines for the

External Memory Interface.

Table 27. Port A Pins Alternate Functions

Port Pin Alternate Function

PA7

AD7 (External memory interface address and data bit 7)

PA6

AD6 (External memory interface address and data bit 6)

PA5

AD5 (External memory interface address and data bit 5)

PA4

AD4 (External memory interface address and data bit 4)

PA3

AD3 (External memory interface address and data bit 3)

PA2

AD2 (External memory interface address and data bit 2)

PA1

AD1 (External memory interface address and data bit 1)

PA0

AD0 (External memory interface address and data bit 0)

Table 28 and Table 29 relates the alternate functions of Port A to the overriding signals

shown in Figure 33 on page 69.

Table 28. Overriding Signals for Alternate Functions in PA7..PA4

Signal

Name

PA7/AD7

PA6/AD6

PA5/AD5

PUOE

PUOV

SRE

~(WR | ADA(1)) •

PORTA7 • PUD

SRE

~(WR | ADA) •

PORTA6 • PUD

SRE

~(WR | ADA) •

PORTA5 • PUD

DDOE

SRE

SRE

SRE

DDOV

WR | ADA

WR | ADA

WR | ADA

PVOE

SRE

SRE

SRE

PVOV

A7 • ADA | D7

OUTPUT • WR

A6 • ADA | D6

OUTPUT • WR

A5 • ADA | D5

OUTPUT • WR

DIEOE

0

0

0

DIEOV

0

0

0

DI

D7 INPUT

D6 INPUT

D5 INPUT

AIO

–

–

–

PA4/AD4

SRE

~(WR | ADA) •

PORTA4 • PUD

SRE

WR | ADA

SRE

A4 • ADA | D4

OUTPUT • WR

0

0

D4 INPUT

–

71

2490G–AVR–03/04

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