ATMEga64L ATMEL Corporation, ATMEga64L Datasheet - Page 71
ATMEga64L
Manufacturer Part Number
ATMEga64L
Description
8-bit AVR Microcontroller with 64K Bytes In-System Programmable Flash
Manufacturer
ATMEL Corporation
Datasheet
1.ATMEGA64L.pdf
(363 pages)
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Alternate Functions of Port A
2490G–AVR–03/04
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
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
PUOE
PUOV
DDOE
DDOV
PVOE
PVOV
DIEOE
DIEOV
DI
AIO
Port Pin
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
~(WR | ADA
PORTA7 • PUD
OUTPUT • WR
A7 • ADA | D7
Alternate Function
AD7 (External memory interface address and data bit 7)
AD6 (External memory interface address and data bit 6)
AD5 (External memory interface address and data bit 5)
AD4 (External memory interface address and data bit 4)
AD3 (External memory interface address and data bit 3)
AD2 (External memory interface address and data bit 2)
AD1 (External memory interface address and data bit 1)
AD0 (External memory interface address and data bit 0)
PA7/AD7
WR | ADA
D7 INPUT
SRE
SRE
SRE
0
0
–
(1)
) •
PORTA6 • PUD
OUTPUT • WR
~(WR | ADA) •
A6 • ADA | D6
PA6/AD6
WR | ADA
D6 INPUT
SRE
SRE
SRE
0
0
–
PORTA5 • PUD
OUTPUT • WR
~(WR | ADA) •
A5 • ADA | D5
PA5/AD5
WR | ADA
D5 INPUT
SRE
SRE
SRE
0
0
–
ATmega64(L)
PORTA4 • PUD
OUTPUT • WR
~(WR | ADA) •
A4 • ADA | D4
PA4/AD4
D4 INPUT
WR | ADA
SRE
SRE
SRE
0
0
–
71
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