AT89C51CC03 Просмотр технического описания (PDF) - Unspecified

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AT89C51CC03

CAN Microcontrollers

Unspecified 

In-System

Programming

ISP allows the user to program or reprogram a microcontroller’s on-chip Flash memory through

the CAN network without removing it from the system and without the need of a pre-pro-

grammed application.

This section describes how to start the CAN bootloader and the higher level protocol over the

CAN.

Boot Process

The bootloader can be activated in two ways:

• Hardware conditions

• Regular boot process

Hardware Conditions

The Hardware conditions (EA = 1, PSEN = 0) during the RESET# falling edge force the on-chip

bootloader execution. In this way the bootloader can be carried out whatever the user Flash

memory content.

As PSEN is an output port in normal operating mode (running user application or bootloader

code) after reset, it is recommended to release PSEN after falling edge of reset signal. The hard-

ware conditions are sampled at reset signal falling edge, thus they can be released at any time

when reset input is low.

6 AT89C51CC03 CAN Bootloader

4251B–CAN–03/08

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