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MC68340 データシート(PDF) 43 Page - Freescale Semiconductor, Inc

部品番号 MC68340
部品情報  Integrated Processor with DMA User?셲 Manual
Download  441 Pages
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メーカー  FREESCALE [Freescale Semiconductor, Inc]
ホームページ  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68340 データシート(HTML) 43 Page - Freescale Semiconductor, Inc

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MOTOROLA
MC68340 USER’S MANUAL
2- 9
2.10.2 Crystal Oscillator (EXTAL, XTAL)
These two pins are the connections for an external crystal to the internal oscillator circuit.
If an external oscillator is used, it should be connected to EXTAL, with XTAL left open.
2.10.3 External Filter Capacitor (XFC)
This pin is used to add an external capacitor to the filter circuit of the phase-locked loop.
The capacitor should be connected between XFC and VCCSYN.
2.10.4 Clock Mode Select (MODCK)
This pin selects the source of the internal system clock during reset. After reset, it can be
programmed to be port B parallel I/O.
MODCK
The state of this active-high input signal during reset selects the source of the internal
system clock. If MODCK is high during reset, the internal voltage-controlled oscillator
(VCO) furnishes the system clock in crystal mode. If MODCK is low during reset, an
external clock source at the EXTAL pin furnishes the system clock output in external
clock mode.
Port B0
This pin can be used as a port B parallel I/O.
2.11 INSTRUMENTATION AND EMULATION SIGNALS
These signals are used for test or software debugging. See Section 5 CPU32 for more
information on these signals and background debug mode.
2.11.1 Instruction Fetch
(IFETCH)
This pin functions as
IFETCH in normal operation and as DSI in background debug mode.
IFETCH
This active-low output signal indicates when the CPU32 is performing an instruction
word prefetch and when the instruction pipeline has been flushed.
DSI
This development serial input signal helps to provide serial communications for
background debug mode.
2.11.2 Instruction Pipe
(IPIPE)
This pin functions as
IPIPE in normal operation and as DSO in background debug mode.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


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