MC68340 datasheet(44/441 Pages) FREESCALE

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MC68340 USER’S MANUAL

MOTOROLA

IPIPE

This active-low output signal is used to track movement of words through the instruction

pipeline.

DSO

This development serial output signal helps to provide serial communications for

background debug mode.

2.11.3 Breakpoint

(BKPT)

This pin functions as

BKPT in normal operation and as DSCLK in background debug

mode.

BKPT

This active-low input signal is used to signal a hardware breakpoint to the CPU32.

DSCLK

This development serial clock input helps to provide serial communications for

background debug mode.

2.11.4 Freeze (FREEZE)

Assertion of this active-high output signal indicates that the CPU32 has acknowledged a

breakpoint and has initiated background mode operation.

2.12 DMA MODULE SIGNALS

The following signals are used by the direct memory access (DMA) controller module to

provide external handshake for either a source or destination. See Section 6 DMA

Module for additional information on these signals.

2.12.1 DMA Request (

DREQ2, DREQ1)

This active-low input is asserted by a peripheral device to request an operand transfer

between that peripheral and memory. The assertion of

DREQ

≈ starts the DMA process.

The assertion level in external burst mode is level sensitive; in external cycle steal mode,

it is falling-edge sensitive.

2.12.2 DMA Acknowledge

(DACK2, DACK1)

This active-low output is asserted by the DMA to signal to a peripheral that an operand is

being transferred in response to a previous transfer request.

2.12.3 DMA Done (

DONE2, DONE1)

This active-low bidirectional signal is asserted by the DMA or a peripheral device during

any DMA bus cycle to indicate that the last data transfer is being performed.

DONE

≈ is an

active input in any mode. As an output, it is only active in external request mode. An

external pullup resistor is required even during operation in the internal request mode.

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