General description

AN2430

10/24

1.4.5

Erase command

Description:

This command allows the user to erase from one to all the sectors of the Flash memory.

When the bootloader receives the Sector Erase command, it transmits the ACK byte.

After the transmission of the ACK byte, the bootloader waits for the number of bytes to be

received (number of sectors to be erased) and then receives from the user the Flash sectors

codes.

Finally, at the end of the command, the bootloader transmits the ACK byte if the erase is

completed successfully otherwise a NACK byte (0x3F) is returned and the command is

exited.

The Erase command procedure is as follows:

1.

Receive one byte which contains the number (N) of sectors to be erased.Here, N can

be a value from 0 to 9,

2.

Receive (N + 1) bytes, each byte contains a sector code. Below all the STR75x sector

codes.

Table 3.

Sector codes

Flash Sector

Sector Code

Bank 0 Sector 0

0x00

Bank 0 Sector 1

0x01

Bank 0 Sector 2

0x02

Bank 0 Sector 3

0x03

Bank 0 Sector 4

0x04

Bank 0 Sector 5

0x05

Bank 0 Sector 6

0x06

Bank 0 Sector 7

0x07

Bank 1 Sector 0

0x10

Bank 1 Sector 1

0x11