56F8014 datasheet(83/125 Pages) FREESCALE

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Introduction

56F8014 Technical Data, Rev. 9

Freescale Semiconductor

Preliminary

7.2.3

Flash Lockout Recovery using CodeWarrior

CodeWarrior can unlock a device using the command sequence described in Section 7.2.2 by selecting the

Debug menu, then selecting DSP56800E, followed by Unlock Flash.

Another mechanism is also built into CodeWarrior using the device’s memory configuration file. The

command “Unlock_Flash_on_Connect1” in the .cfg file accomplishes the same task as using the Debug

menu.

7.2.4

Product Analysis

The recommended method of unsecuring a programmed 56F8014 for product analysis of field failures is

via the backdoor key access. The customer would need to supply Technical Support with the backdoor key

and the protocol to access the backdoor routine in the Flash. Additionally, the KEYEN bit that allows

backdoor key access must be set.

An alternative method for performing analysis on a secured microcontroller would be to mass-erase and

reprogram the Flash with the original code, but modify the security bytes.

To insure that a customer does not inadvertently lock himself out of the 56F8014 during programming, it

is recommended that the user program the backdoor access key first, the application code second and the

security bytes within the FM configuration field last.

Part 8 General Purpose Input/Output (GPIO)

8.1 Introduction

This section is intended to supplement the GPIO information found in the 56F801X Peripheral Reference

Manual and contains only chip-specific information. This information supercedes the generic information

in the 56F801X Peripheral Reference Manual.

8.2 Configuration

There are four GPIO ports defined on the 56F8014. The width of each port, the associated peripheral and

reset functions are shown in Table 8-1. The specific mapping of GPIO port pins is shown in Table 8-2.

Table 8-1 GPIO Ports Configuration

GPIO Port

Available

Pins in

56F8014

Peripheral Function

Reset Function

PWM, Reset

GPIO, except GPIOA7

SPI, SCI, Timer

GPIO

ADC

Analog

JTAG

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