68HC05JB3 datasheet(52/134 Pages) FREESCALE

52 / 134 page

GENERAL RELEASE SPECIFICATION

November 5, 1998

MOTOROLA

INPUT/OUTPUT PORTS

MC68HC05JB3

7-6

REV 1

DDRCx — PCx Data Direction

1 =

Port pin set as output.

0 =

Port pin set as input.

VROFF — USB 3.3V Voltage Reference

See USB section for details.

1 =

Disable 3.3V regulator.

0 =

Enables 3.3V regulator.

OCMPO — OCMP Output Enable

See 16-BIT TIMER section for details.

1 =

PC0 is OCMP pin, OCF from 16-bit timer output compare.

0 =

PC0 is standard I/O pin, from Port-C data register.

7.3.3 Port-C Pull-down/up Register

With the pull-up/down mask option selected, each pin in Port-C has an internal

pull-down resistor which can be enabled by writing a ‘0’ to the corresponding bit in

the Port-C pull-down/up control register (PDURC) at location $000F.

PDRCx — PCx Pin Pull-down Enable

1 =

Internal pull-down disabled.

0 =

Internal pull-down enabled.

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

PDURC

$000F

PDRC3

PDRC2

PDRC1

PDRC0

reset:

00000000

Freescale Semiconductor, Inc.

For More Information On This Product,

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