AT89C5131A-RDTUM datasheet(46/188 Pages) ATMEL

46 / 188 page

4337K–USB–04/08

AT89C5130A/31A-M

Figure 11-1. Flash Memory Mapping

11.2

Boot Process

11.2.1

Software Boot Process Example

Many algorithms can be used for the software boot process. Below are descriptions of the differ-

ent flags and Bytes.

Boot Loader Jump bit (BLJB):

- This bit indicates if on RESET the user wants to jump to this application at address @0000h on

FM0 or execute the boot loader at address @F400h on FM1.

- BLJB = 0 (i.e. bootloader FM1 executed after a reset) is the default Atmel factory programming.

-To read or modify this bit, the APIs are used.

Boot Vector Address (SBV):

- This byte contains the MSB of the user boot loader address in FM0.

- The default value of SBV is FFh (no user boot loader in FM0).

- To read or modify this byte, the APIs are used.

Extra Byte (EB) & Boot Status Byte (BSB):

- These Bytes are reserved for customer use.

- To read or modify these Bytes, the APIs are used.

F400h

7FFFh

32K Bytes

Flash Memory

3K Bytes IAP

Bootloader

FM0

FM1

Custom

Bootloader

[SBV]00h

FFFFh

FM1 Mapped between F400h and FFFFh

when API Called

0000h

3FFFh

16K Bytes

Flash Memory

FM0

Custom

Bootloader

[SBV]00h

0000h

C5130A

C5131A

AT89C5131A-RDTUM 데이터시트(PDF) 46 Page - ATMEL Corporation

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