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ATMEGA1280 データシート(PDF) 88 Page - ATMEL Corporation |
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ATMEGA1280 データシート(HTML) 88 Page - ATMEL Corporation |
88 / 407 page 88 ATmega640/1280/1281/2560/2561 2549A–AVR–03/05 MCU Control Register – MCUCR • Bit 4 – 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 82 for more details about this feature. Alternate Functions of Port A The Port A has an alternate function as the address low byte and data lines for the External Memory Interface. Table 37 and Table 38 relates the alternate functions of Port A to the overriding signals shown in Figure 37 on page 86. Note: 1. ADA is short for ADdress Active and represents the time when address is output. See “External Memory Interface” on page 29 for details. Bit 7 6 5 4 3 2 1 0 JTD – –PUD – – IVSEL IVCE MCUCR Read/Write R/W R R R/W R R R/W R/W Initial Value 0 0 0 0 0 0 0 0 Table 36. 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 37. 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 • PUD ~(WR | ADA) • PORTA6 • PUD ~(WR | ADA) • PORTA5 • PUD ~(WR | ADA) • PORTA4 • PUD 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 0 0 0 DIEOV 0 0 0 0 DI D7 INPUT D6 INPUT D5 INPUT D4 INPUT AIO – – – – |
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同様の説明 - ATMEGA1280 |
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