MAC7200 datasheet(96/976 Pages) FREESCALE

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MCU Mode Selection

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

Once the MCU Mode has been set, it may only be changed by any of the following:

•

Securing the flash, and resetting the device. In this case the mode changes from “Normal XX

Mode” to “Secured XXX Mode”.

•

Unsecuring the flash, and resetting the device. In this case the mode changes from “Secured XXX

Mode” to “Normal XXX Mode”.

•

Changing the MODA/MODB pins and resetting the device. In this case the mode changes from

“Normal XXX Mode” to “Normal YYY Mode” or from “Secured XXX Mode” to “Secured YYY

Mode”.

Note that resetting the device is mandatory in all three cases.

2.4.1

Normal Single Chip Mode

In Normal Single Chip Mode, the system boots from the Flash main array. The system may be configured

to enable the external bus.

•

EICE/Nexus/JTAG active

— Enable TCK, TDI, TDO and DBGEN

•

FlexBus available at $2000 0000

•

Boot from Flash main array at $0000 0000

— Shadow Block available at $00f0 0000

•

JTAG Lockout Recovery is available

2.4.2

Secured Single Chip Mode

In Secured Single Chip Mode, the system boots from the Flash main array. The external bus interface is

unavailable.

•

No EICE/Nexus/JTAG

— Disable DBGEN and Nexus clock(s)

Table 2-2. MCU Mode Selection

MODA

(PD1)

MODB

(PD0)

Flash

Secured ?

Chip Mode

Normal Single Chip Mode

Normal Expanded Mode

Normal Primary Bootloader Mode

Reserved for future use

Yes

Secured Single Chip Mode

Yes

Secured Expanded Mode

Yes

Secured Primary Bootloader Mode

Yes

Reserved for future use

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