ATMEGA64-16MI View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
ATMEGA64-16MI
Atmel Corporation
ATMEGA64-16MI Datasheet PDF : 363 Pages
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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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