M68SDIL datasheet(89/460 Pages) MOTOROLA

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Bus Control and Input/Output

Registers

MC68HC912D60A — Rev 3.0

Technical Data

MOTOROLA

Bus Control and Input/Output

This register is associated with external bus control signals and interrupt

inputs, including data bus enable (DBE), mode select (MODB/IPIPE1,

MODA/IPIPE0), ECLK, size (LSTRB), read/write (R/W), IRQ, and XIRQ.

When the associated pin is not used for one of these specific functions,

the pin can be used as general-purpose I/O. The port E assignment

primary direction of each port E pin when configured to be general-

purpose I/O.

Some of these pins have software selectable pull-ups (DBE, LSTRB,

R/W, IRQ, and XIRQ). A single control bit enables the pull-ups for all

these pins which are configured as inputs.

This register is not in the map in peripheral mode or expanded modes

when the EME bit is set.

Read and write anytime.

This register determines the primary direction for each port E pin

configured as general-purpose I/O.

BIT 7

654

321

BIT 0

PE7

PE6

PE5

PE4

PE3

PE2

PE1

PE0

RESET:

—

————

—

Alt. Pin

Function

DBE or

ECLK or

CAL

MODB or

IPIPE1 or

CGMTST

MODA or

IPIPE0

ECLK

LSTRB or

BDTAGL or

TAGLO

R/W

IRQ

XIRQ

PORTE — Port E Register

$0008

Bit 7

Bit 0

DDE7

DDE6

DDE5

DDE4

DDE3

DDE2

RESET:

DDRE — Port E Data Direction Register

$0009

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

M68SDIL Datasheet(PDF) 89 Page - Motorola, Inc

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