Rainbow-electronics ATmega8515L Manual de usuario descargar pdf (Pagina 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•

A5 • ADA |

D5 OUTPUT•

A4 • ADA |

D4 OUTPUT•

DIEOE 0000

DIEOV0 0 0 0

DI D7 INPUT D6 INPUT D5 INPUT D4 INPUT

AIO ––––

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 ... 222 223

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