MPC5644B datasheet(63/114 Pages) FREESCALE

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MPC5646C Microcontroller Data Sheet, Rev. 3

Preliminary—Subject to Change Without Notice

Freescale Semiconductor

4.10.3

Flash memory start-up/switch-off timings

4.11

Electromagnetic compatibility (EMC) characteristics

Susceptibility tests are performed on a sample basis during product characterization.

4.11.1

Designing hardened software to avoid noise problems

EMC characterization and optimization are performed at component level with a typical application environment and simplified

MCU software. It should be noted that good EMC performance is highly dependent on the user application and the software in

particular.

Therefore it is recommended that the user apply EMC software optimization and pre-qualification tests in relation with the EMC

level requested for the application.

•

Software recommendations

The software flowchart must include the management of runaway conditions such as:

— Corrupted program counter

— Unexpected reset

— Critical data corruption (control registers)

•

Pre-qualification trials

Most of the common failures (unexpected reset and program counter corruption) can be

reproduced by manually forcing a low state on the reset pin or the oscillator pins for 1 second.

To complete these trials, ESD stress can be applied directly on the device. When unexpected behavior is detected, the

software can be hardened to prevent unrecoverable errors occurring.

Table 30. Start-up time/Switch-off time

Symbol

Parameter

Conditions1

1 V

DD = 3.3 V ± 10% / 5.0 V ± 10%, TA = 40 to 125 °C, unless otherwise specified.

Value

Unit

Min

Typ

Max

TFLARSTEXIT CC D Delay for flash memory module to exit

reset mode

Code flash

memory

—

125

µs

Data flash

memory

——

TFLALPEXIT

CC T Delay for flash memory module to exit

low-power mode

Code flash

memory

——

—

0.5

TFLAPDEXIT

CC T Delay for flash memory module to exit

power-down mode

Code flash

memory

——

—

Data flash

memory

——

TFLALPENTRY CC T Delay for flash memory module to enter

low-power mode

Code flash

memory

——

—

0.5

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