Rainbow-electronics ATmega8515L Manual do Utilizador Página 63
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63
ATmega8515(L)
2512A–AVR–04/02
Alternate Functions of Port A PortAhas an alternate function as theaddress lowbyte anddata linesfor the External
Memory Interface.
Table27 and Table28relate thealternate functions of PortAtotheoverriding signals
showninFigure 32onpage 61.
Note: 1. ADAisshort for ADdress Active andrepresents thetimewhen address is output. See
“ExternalMemory Interface” on page 22.
Table 26. PortAPins Alternate Functions
Port Pin Alternate Function
PA 7 AD7 (External memory interfaceaddress anddata bit 7)
PA 6 AD6 (External memory interfaceaddress anddata bit 6)
PA 5 A D5 (External memory interfaceaddress anddata bit 5)
PA 4 A D4 (External memory interfaceaddress anddata bit 4)
PA 3 AD3 (External memory interfaceaddress anddata bit 3)
PA 2 A D2 (External memory interfaceaddress anddata bit 2)
PA 1 A D1 (External memory interfaceaddress anddata bit 1)
PA 0 A D0 (External memory interfaceaddress anddata bit 0)
Table 27. Overriding Signals for Alternate Functions in PA7..PA4
Signal
Name PA7/AD7 PA6/AD6 PA5/AD5 PA4/AD4
PUOE SRESRESRESRE
PUOV ~(WR
| ADA
(1)
) •
PortA7
~(WR | ADA) •
PortA6
~(WR | ADA) •
PortA5
~(WR | ADA) •
PortA4
DDOE SRESRESRESRE
DDOV WR
| ADA WR | ADA WR | ADA WR | ADA
PVOE SRESRESRESRE
PVOVA7 •ADA |
D7 OUTPUT•WR
A6 •ADA |
D6 OUTPUT•
WR
A5 • ADA |
D5 OUTPUT•
WR
A4 • ADA |
D4 OUTPUT•
WR
DIEOE 0000
DIEOV0 0 0 0
DI D7 INPUT D6 INPUT D5 INPUT D4 INPUT
AIO ––––
- Features 1
- ATmega8515(L) 10
- 2512A–AVR–04/02 44
- WATCHDOG 48
- OSCILLATOR 48
- I/O Ports 56
- Ports as General Digital 57
- 8-bit Timer/Counter0 77
- Timer/Counter Clock 78
- OCn Interrupt Flag Set 82
- (COMn1:0 = 1) 82
- 2512A–AVR–04/02 0M 223
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