PL460 datasheet(20/48 Pages) MICROCHIP

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PL460

Bootloader

Data Sheet

DS60001666D - 20

Functional Description (continued)

Command Description

addr(31:0)

data(n*32-1:0)

0xA66A Control of MISO signal transferred to M7-SPI and Bootloader clock

disabled

0x00000000

0xDE05 Unblock bootloader

0x00000000

0xDDDDDDDD (Note 2)

Notes:

1. ‘AA’ is an address byte.

2. ‘DD’ is a data byte.

3. Command contains as many bytes as needed to send.

4. Command contains as many ‘00’s as bytes wanted to be read.

The figure below shows the structure of the registers and data transfers for fuses and their control

logic.

7.4.1.

Unlock, Load Program and Start Loaded Program

After Reset, the bootloader is locked and the host must send the following two frames as a

password to unlock the bootloader.

Order

Address

Command

Data

0x00000000

0xDE05

0x5345ACBA

0x00000000

0xDE05

0xACBA5345

At this point, the host sends commands to the bootloader and it can start loading the program to

the PL460. The program must be loaded starting with address 0x00000000.

After loading the program, it must be started. Starting the loaded program requires clearing the

CPUWAIT bit of the MSSC Miscellaneous register (address 0x400E1800) and transferring control of

the MISO signal to the M7-SPI peripheral.

Order

Address

Command

Data

0x400E1800

0x0000

0x00000000

0xA66A

0x00000000

If this action is not done, the MISO signal will remain controlled by the bootloader.

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