ATMEGA649 datasheet(67/375 Pages) ATMEL

67 / 375 page

ATmega329/3210/649/6410

2552H–AVR–11/06

MCUCR – MCU Control

• 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 60 for more details about this feature.

Alternate Functions of Port A

The Port A has an alternate function as COM0:3 and SEG0:3 for the LCD Controller.

Table 28 and Table 29 relates the alternate functions of Port A to the overriding signals

shown in Figure 27 on page 65.

Bit

0x35 (0x55)

JTD

–

–PUD

–

IVSEL

IVCE

MCUCR

Read/Write

R/W

Initial Value

Table 27. Port A Pins Alternate Functions

Port Pin

Alternate Function

PA7

SEG (LCD Front Plane 3)

PA6

SEG (LCD Front Plane 2)

PA5

SEG (LCD Front Plane 1)

PA4

SEG (LCD Front Plane 0)

PA3

COM (LCD Back Plane 3)

PA2

COM (LCD Back Plane 2)

PA1

COM (LCD Back Plane 1)

PA0

COM (LCD Back Plane 0)

Table 28. Overriding Signals for Alternate Functions in PA7..PA4

Signal

Name

PA7/SEG3

PA6/SEG2

PA5/SEG1

PA4/SEG0

PUOE

LCDEN

PUOV

000

DDOE

LCDEN

DDOV

PVOE

000

PVOV

000

PTOE

–––

–

DIEOE

LCDEN

DIEOV

000

–––

–

AIO

LCDSEG

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