PC87591L datasheet(225/437 Pages) NSC

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Embedded Controller Modules (Continued)

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Main Block Page Erase

Pages in the Main Block may be erased one at a time. The size of the pages are defined in Table 30 on page 221 and “Flash

Read, Write and Erase Time” on page 222. To enable erasing by the core or host, the page must be enabled for write.

1. Verify that the flash is not busy.

2. Prevent access to the flash while erase is in progress, if required.

3. Set the page erase bit.

4. Write to an address in the desired page.

5. Wait until the busy bit is cleared and check the error flags to see if the erase was successful.

6. To erase additional pages, repeat steps 3 through 5.

7. Clear the page erase bit to prevent accidental erase operations.

To erase a page using the JTAG interface, see Section 4.19.4 on page 251.

Information Block Page Erase

Pages in the Information Block may be erased one at a time. The size of the pages are defined in Table 30 on page 221 and

Table 31 on page 221. Note that the factory parameters and the protection information may not be updated by the core.

To erase a page using the JTAG interface, see Section 4.19.4 on page 251. Note that the Factory Parameters page may

not be erased by the JTAG interface.

Main Block Section Erase

Sections in the Main Block may be erased with a single erase operation. The size of the sections are defined in Table 30 on

page 221 and Table 31 on page 221. To enable an erase by the core, the entire section must be enabled for write. Note that

Host-initiated section erases are not allowed.

1. Verify that the flash is not busy.

2. Prevent access to the flash while erase is in progress, if required.

3. Set the section erase bit in the control register (SMER bit in FLCR register).

4. Write to an address in the desired section.

5. Wait until the busy bit is cleared and check the error flags to see if the erase was successful.

6. To erase additional sections, repeat steps 3 through 5.

7. Clear the section erase bit (SMER bit in FLCR register) to prevent accidental erase operation.

To erase a page using the JTAG interface, see Section 4.19.4 on page 251.

Main and Information Block Section Erase

Sections in the Main Block and Information Block may be erased simultaneously using a single erase operation. The size of

the sections are defined in Table 30 on page 221 and Table 31 on page 221. To erase a section using the JTAG interface,

see Section 4.19.4 on page 251.

Special Erase

This operation is enabled only for the JTAG interface. If the Flash Contents Protection bit is set, this operation should be

done to enable any other access to the flash (or to enable the Debugger interface functions).

To perform a special erase using the JTAG interface, see Section 4.19.4 on page 251.

Program the Main Block

The program operation enables changing bits with a value of 1 to 0. Each byte address of the Main Block may be programed

once before being erased. If required, perform an erase operation prior to the program operation. To program a byte in the

Main Block:

1. Verify that the flash is not busy.

2. Prevent access to the flash while the program operation is in progress, if required.

3. Set the program bit in the control register (PE bit in FLCR register).

4. Write to the byte or word that needs to be programed.

5. Wait until the busy bit is cleared and check the error flags to see if the program operation was successful.

6. To program additional bytes/words, repeat steps 3 through 5.

To program a byte or word using the JTAG interface, see Section 4.19.4 on page 251.

PC87591L Datasheet(PDF) 225 Page - National Semiconductor (TI)

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