SCF5250 datasheet(19/48 Pages) MOTOROLA

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Signal Descriptions

SCF5250 Integrated ColdFire® Microprocessor Data Sheet, Rev. 1.1

Freescale Semiconductor

4.17 Crystal Trim

The XTRIM/GPIO0 output produces a pulse-density modulated phase/frequency difference signal to be

used after low-pass filtering to control varicap-voltage to control crystal oscillation frequency. This will

lock the crystal to the incoming digital audio signal.

4.18 Clock Out

The MCLK1/GPIO11 and QSPI_CS2/MCLK2/GPIO24 can serve as DAC clock outputs. When

programmed as DAC clock outputs, these signals are directly derived from the crystal oscillator or clock

Input (CRIN).

4.19 Debug and Test Signals

These signals interface with external I/O to provide processor debug and status signals.

4.19.1 Test Mode

The TEST[2:0] inputs are used for various manufacturing and debug tests. For normal mode TEST [2:1]

should be ways be tied low. TEST0 should be set high for BDM debug mode and set low for JTAG mode.

4.19.2 High Impedance

The assertion of HI_Z will force all output drivers to a high-impedance state. The timing on HI_Z is

independent of the clock.

NOTE

JTAG operation will override the HI_Z pin.

4.19.3 Processor Clock Output

The internal PLL generates this PSTCLK/GPIO51 and output signal, and is the processor clock output that

is used as the timing reference for the Debug bus timing (DDATA[3:0] and PST[3:0]). The

PSTCLK/GPIO51 is at the same frequency as the core processor.

QSPICS0/EBUIN4GPIO15

4 different QSPI chip selects

QSPICS1/EBUOUT2/GPIO16

QSPICS2/MCLK2/GPIO24

CS1/QSPICS3/GPIO28

Table 12. Queued Serial Peripheral Interface (QSPI) Signals (continued)

Serial Module Signal

Description

SCF5250 датащи(PDF) 19 Page - Motorola, Inc