56F8014 datasheet(84/124 Pages) FREESCALE

84 / 124 page

56F8014 Technical Data, Rev. 11

Freescale Semiconductor

in order to return to normal unsecured operation. Power-on reset will also reset both.

The user is responsible for directing the device to invoke the flash programming subroutine to reprogram

the word $0000 into program memory location $00 1FF7. This is done by, for example, toggling a specific

pin, or by downloading a user-defined key through serial interfaces.

Note:

Flash contents can only be programmed for 1s to 0s.

7.3 Product Analysis

The recommended method of unsecuring a secured device for product analysis of field failures is via the

method suggested in section 7.2.4. The customer would need to supply Technical Support with the details

of the protocol to access the subroutines in flash. An alternative method for performing analysis on a

secured device would be to mass-erase and reprogram the flash with the original code, but also either

modify the security word or else not program the security word.

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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