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MC68008

8-/16-/32-Bit Microprocessors User’s Manual

Freescale Semiconductor 

Freescale Semiconductor, Inc.

SECTION 3

SIGNAL DESCRIPTION

This section contains descriptions of the input and output signals. The input and output

signals can be functionally organized into the groups shown in Figure 3-1 (for the

MC68000, the MC68HC000 and the MC68010), Figure 3-2 ( for the MC68HC001), Figure

3-3 (for the MC68EC000), Figure 3-4 (for the MC68008, 48-pin version), and Figure 3-5

(for the MC68008, 52-pin version). The following paragraphs provide brief descriptions of

the signals and references (where applicable) to other paragraphs that contain more

information about the signals.

NOTE

The terms assertion and negation are used extensively in this

manual to avoid confusion when describing a mixture of

"active-low" and "active-high" signals. The term assert or

assertion is used to indicate that a signal is active or true,

independently of whether that level is represented by a high or

low voltage. The term negate or negation is used to indicate

that a signal is inactive or false.

VCC(2)

GND(2)

CLK

PROCESSOR

STATUS

MC6800

PERIPHERAL

CONTROL

SYSTEM

CONTROL

FC0

FC1

FC2

E

VMA

VPA

BERR

RESET

HALT

ADDRESS

BUS

DATA BUS

AS

R/W

UDS

LDS

DTACK

A23–A1

D15–D0

ASYNCHRONOUS

BUS

CONTROL

BR

BG

BGACK

IPL0

IPL1

IPL2

BUS

ARBITRATION

CONTROL

INTERRUPT

CONTROL

Figure 3-1. Input and Output Signals

(MC68000, MC68HC000 and MC68010)

MOTOROLA

M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL

3-1

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