TMP86FS49AIUG datasheet(242/296 Pages) TOSHIBA

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Page 226

19. Flash Memory

19.2 Command Sequence

TMP86FS49AIUG

A maximum of 30 ms is required to erase 4 kbytes. The next command sequence cannot be executed until the

erase operation is completed. To check the completion of the erase operation, perform read operations repeat-

edly for data polling until the same data is read twice from the same address in the flash memory. During the

erase operation, any consecutive attempts to read from the same address is reversed bit 6 of the data (toggling

between 0 and 1).

19.2.3 Chip Erase (All Erase)

This command erases the entire flash memory in approximately 30 ms. The next command sequence cannot

be executed until the erase operation is completed. To check the completion of the erase operation, perform

read operations repeatedly for data polling until the same data is read twice from the same address in the flash

memory. During the erase operation, any consecutive attempts to read from the same address is reversed bit 6

of the data (toggling between 0 and 1). After the chip is erased, all bytes contain FFH.

19.2.4 Product ID Entry

This command activates the Product ID mode. In the Product ID mode, the vendor ID, the flash ID, and the

read protection status can be read from the flash memory.

Note: The value at address F002H (flash size) depends on the size of flash memory incorporated in each product. For example, if

the product has 60-kbyte flash memory, "0EH" is read from address F002H.

19.2.5 Product ID Exit

This command is used to exit the Product ID mode.

19.2.6 Read Protect

This command enables the read protection setting in the flash memory. When the read protection is enabled,

the flash memory cannot be read in the parallel PROM mode. In the serial PROM mode, the flash write and

RAM loader commands cannot be executed.

To enable the read protection setting in the serial PROM mode, set FLSCR<BANKSEL> to "1" before exe-

cuting the read protect command sequence. To disable the read protection setting, it is necessary to execute the

chip erase command sequence. Whether or not the read protection is enabled can be checked by reading

FF7FH in the Product ID mode. For details, see Table 19-4.

Table 19-4 Values To Be Read in the Product ID Mode

Address

Meaning

Read Value

F000H

Vendor ID

98H

F001H

Flash macro ID

41H

F002H

Flash size

0EH:

60 kbytes

0BH:

48 kbytes

07H:

32 kbytes

05H:

24 kbytes

03H:

16 kbytes

01H:

8 kbytes

00H:

4 kbytes

FF7FH

Read protection status

FFH:

Read protection disabled

Other than FFH: Read protection enabled

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