Rainbow-electronics ATmega162V Manual de usuario descargar pdf (Pagina 69)

ATmega162/V

2513E–AVR–09/03

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 63 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 and as Pin Change Interrupt.

Table 30 and Table 31 relate the alternate functions of Port A to the overriding signals

shown in Figure 32 on page 67.

Bit 7 6 5 4 3 2 1 0

TSM XMBK XMM2 XMM1 XMM0 PUD PSR2 PSR310 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 29. Port A Pins Alternate Functions

Port Pin Alternate Function

PA7

AD7 (External memory interface address and data bit 7)

PCINT7 (Pin Change INTerrupt 7)

PA6

AD6 (External memory interface address and data bit 6)

PCINT6 (Pin Change INTerrupt 6)

PA5

AD5 (External memory interface address and data bit 5)

PCINT5 (Pin Change INTerrupt 5)

PA4

AD4 (External memory interface address and data bit 4)

PCINT4 (Pin Change INTerrupt 4)

PA3

AD3 (External memory interface address and data bit 3)

PCINT3 (Pin Change INTerrupt 3)

PA2

AD2 (External memory interface address and data bit 2)

PCINT2 (Pin Change INTerrupt 2)

PA1

AD1 (External memory interface address and data bit 1)

PCINT1 (Pin Change INTerrupt 1)

PA0

AD0 (External memory interface address and data bit 0)

PCINT0 (Pin Change INTerrupt 0)

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 322 323

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Rainbow-electronics ATmega162V Manual de usuario Pagina 69