MAC7200 datasheet(98/976 Pages) FREESCALE

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Oscillator Type Selection

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

•

Relocate Flash to $2000 0000

— Shadow Block available at $20f0 0000

•

Relocate FlexBus to $0000 0000

•

Boot from FlexBus

2.4.6

Secured Expanded Mode

In Secured Expanded Mode, the MCU boots from an external source by accessing external memory and

hardware across the external Address and Data bus. In this mode the Flash main array and Shadow Block

are unavailable. Neither the Flash main array or the Shadow Block can be accessed, except for the accesses

necessary to unsecure the device.

•

EICE/Nexus/JTAG active

— Enable TCK, TDI, TDO and DBGEN

•

Disable Flash Main Array and Shadow Block access

•

Relocate FlexBus to $0000 0000

•

Boot from FlexBus

See Chapter 9, “Device Memory Map” for more detailed information on how each chip mode affects

relocation of system resources.

2.5

Oscillator Type Selection

At Reset the type of Oscillator can be selected using the XCLKS pin.

The oscillator mode (XCLKS) is latched only during a power-on reset and during a reset while a loss of

clock has occurred. It is not latched during a normal system reset. Please refer to Chapter 24, “Oscillator

(OSC)” for more information on configuring and using the oscillator.

2.6

Nexus Port Selection

If use of the Nexus Port is required for debugging, it may be connected to either the Nexus Primary Port

or the Nexus Secondary Port. The hardware configuration pins associated with the Nexus are:

Table 2-3. Oscillator Type Selection

Reset State Definition

XCLKS

(PD2)

This bit determines the mode of the oscillator as follows:

0 External Clock Mode

1ALC Mode

Please refer to Section 24.8.1, “OSC Mode Selection” for more details on the various oscillator modes.

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