Renesas HS6400FDIW3S Manual do Utilizador descarregar pdf (Página 26)

Chapter 3 Basic Operation

3.1 Background Information

3.1.1

What are the User and User Boot Areas?

The normal area of (internal) flash for Renesas devices, for user programs is known as the

User Area

This is where the code is stored which gets executed when the device is reset into User Mode. The

User area

can normally be programmed from a Boot Mode or User Mode connection.

On some devices there is an additional area of flash known as the

User Boot Area

. This is where the

code is stored which gets executed when the device is reset into

User Boot Mode

. The User Boot

Area tends to be much smaller than the User Area and is typically used for storing an alternative boot

stub, for setting up communication via some other communications medium / protocol. Normally, the

User Area and the User Boot Area both start at the same address – this is possible because only one is

ever mapped into the memory map at one time. It is only possible to program the User Boot Area from

Boot Mode - not from User Mode.

3.1.2

What is the difference between Boot Mode and User Mode?

The Renesas Flash devices have different modes of operation which are controlled by the state of the

mode pins when the device is brought out of reset. Most devices have an asynchronous serial Boot

Mode and a User/User Program Mode.

Generally, (asynchronous serial)

Boot Mode

connections, start with an autobaud – sending

synchronisation data packets to setup initial communications at a given baud rate. Additionally, for

most devices, the entire flash will be erased as part of the connection process, thus preventing any

Intellectual Property held on the device from being read from Boot Mode.

For a

User Mode

connection, the device must already be programmed with some code which talks to

FDT and allows programming. Most kernels are supplied with a User Mode micro kernel and test

program (*usually called “uGenU.mot” and “xxxxtest.mot”). These files provide a

demonstration of User Mode programming and must be programmed into the device and be executing

before FDT tries to connect in User Mode. User Mode does not normally force an erase of the flash

during the connection process and does not autobaud to setup initial communications. The

demonstration User Mode test programs have the required Bit Rate Register value compiled into them

for setting up initial communications at 9600 baud; hence User Mode kernels need to be rebuilt for

different clock frequencies.

*Note that where the files are to be used as part of an embedded monitor, the User Mode kernel files may be also output as

binary files (.cde) without the reset vector populated. Some kernels use only a single file for the User Mode test program (e.g.

Protocol C kernels).

3.1.3

What is the difference between User Mode and User Program Mode?

Some devices use an additional mode pin to protect the flash from being written or erased by mistake;

this pin is normally known as the “Flash Write Enable” pin (FWE) if it has to be logic high to allow

programming, or the “Flash Write Protect” pin (FWP) if it has to be logic low to allow programming.

For these devices, this pin distinguishes “User Mode” from “User Program Mode”. An FDT User

Mode connection expects the device to be in User Program Mode at the point of programming and

erasing, and if using the FDM, can reset the device into User Mode to execute the programmed code

on disconnection.

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