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ATMEGA8515-16AU Datasheet(PDF) 65 Page - ATMEL Corporation

Part # ATMEGA8515-16AU
Description  8-bit AVR Microcontroller with 8K Bytes In-System Programmable Flash
Download  254 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA8515-16AU Datasheet(HTML) 65 Page - ATMEL Corporation

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65
ATmega8515(L)
2512G–AVR–03/05
Special Function IO Register –
SFIOR
• Bit 2 – PUD: Pull-up Disable
When this bit is written to one, the pull-ups in the I/O ports are disabled even if the DDxn
and PORTxn Registers are configured to enable the pull-ups ({DDxn, PORTxn} = 0b01).
See “Configuring the Pin” on page 59 for more details about this feature.
Alternate Functions of Port A
Port A has an alternate function as the address low byte and data lines for the External
Memory Interface.
Table 27 and Table 28 relate the alternate functions of Port A to the overriding signals
shown in Figure 33 on page 63.
Note:
1. ADA is short for ADdress Active and represents the time when address is output. See
“External Memory Interface” on page 24.
Bit
7
6
5
4
3
2
1
0
XMBK
XMM2
XMM1
XMM0
PUD
PSR10
SFIOR
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Table 26. 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 27. Overriding Signals for Alternate Functions in PA7..PA4
Signal
Name
PA7/AD7
PA6/AD6
PA5/AD5
PA4/AD4
PUOE
SRE
SRE
SRE
SRE
PUOV
~(WR | ADA(1)) •
PortA7
~(WR | ADA) •
PortA6
~(WR | ADA) •
PortA5
~(WR | ADA) •
PortA4
DDOE
SRE
SRE
SRE
SRE
DDOV
WR | ADA
WR | ADA
WR | ADA
WR | ADA
PVOE
SRE
SRE
SRE
SRE
PVOV
A7 • ADA |
D7 OUTPUT • WR
A6 • ADA |
D6 OUTPUT •
WR
A5 • ADA |
D5 OUTPUT •
WR
A4 • ADA |
D4 OUTPUT •
WR
DIEOE
0
000
DIEOV
0
000
DI
D7 INPUT
D6 INPUT
D5 INPUT
D4 INPUT
AIO
–––


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