TMP86FS49AIUG datasheet(276/296 Pages) TOSHIBA

276 / 296 page

Page 260

20. Serial PROM Mode

20.13 Specifying the Erasure Area

TMP86FS49AIUG

20.13Specifying the Erasure Area

In the flash memory erasing mode, the erasure area of the flash memory is specified by n

−2 byte data.

The start address of an erasure area is specified by ERASTA, and the end address is specified by ERAEND.

If ERASTA is equal to or smaller than ERAEND, the sector erase (erasure in 4 kbyte units) is executed. Executing

the sector erase while the read protection is enabled results in an infinite loop.

If ERASTA is larger than ERAEND, the chip erase (erasure of an entire flash memory area) is executed and the

read protection is disabled. Therefore, execute the chip erase (not sector erase) to disable the read protection.

Note: When the sector erase is executed for the area containing no flash cell, TMP86FS49AIUG stops the UART commu-

nication and enters the halt condition.

Erasure Area Specification Data (n

−2 byte data)

765

43210

ERASTA

ERAEND

ERASTA

The start address of the

erasure area

0000:

0001:

0010:

0011:

0100:

0101:

0110:

0111:

1000:

1001:

1010:

1011:

1100:

1101:

1110:

1111:

from 0000H

from 1000H

from 2000H

from 3000H

from 4000H

from 5000H

from 6000H

from 7000H

from 8000H

from 9000H

from A000H

from B000H

from C000H

from D000H

from E000H

from F000H

ERAEND

The end address of the

erasure area

0000:

0001:

0010:

0011:

0100:

0101:

0110:

0111:

1000:

1001:

1010:

1011:

1100:

1101:

1110:

1111:

to 0FFFH

to 1FFFH

to 2FFFH

to 3FFFH

to 4FFFH

to 5FFFH

to 6FFFH

to 7FFFH

to 8FFFH

to 9FFFH

to AFFFH

to BFFFH

to CFFFH

to DFFFH

to EFFFH

to FFFFH

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