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ATMEGA8515-16AU Datasheet(PDF) 65 Page - ATMEL Corporation |
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ATMEGA8515-16AU Datasheet(HTML) 65 Page - ATMEL Corporation |
65 / 254 page ![]() 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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