MMC2107 Datasheet, PDF (122/618 Pages) –

Signal Description
Freescale Semiconductor, Inc.
4.5.2 Phase-Lock Loop (PLL) and Clock Signals
These signals are used to support the on-chip clock generation circuitry.
4.5.2.1 External Clock In (EXTAL)
This input signal is always driven by an external clock input except when
used as a connection to the external crystal when the internal oscillator
circuit is used. The clock source is configured during reset.
4.5.2.2 Crystal (XTAL)
This output signal is used as a connection to the external crystal when
the internal oscillator circuit is used. XTAL should be grounded when
using an external clock input.
4.5.2.3 Clock Out (CLKOUT)
This output signal reflects the internal system clock.
4.5.2.4 Synthesizer Power (V_DDSYN and V_SSSYN)
These are dedicated quiet power and ground supply signals for the
frequency synthesizer circuit.
4.5.3 External Memory Interface Signals
In addition to the function stated here, these signals can be configured
as discrete I/O signals also.
4.5.3.1 Data Bus (D[31:0])
These three-state bidirectional signals provide the general-purpose data
path between the microcontroller unit (MCU) and all other devices.
Technical Data
122
Signal Description
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MMC2107 – Rev. 2.0
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