TMP89FS60 datasheet(373/410 Pages) TOSHIBA

373 / 410 page

Page 359

TMP89FS60

RA002

22.12.1.3Password setting, cancellation and authentication

• Password setting

Because a password is created by using part of a user program, a special password setting

routine is unnecessary. A password can be set by simply writing a program to flash memory.

• Password cancellation

To cancel a password, Chip Erase (all erase) must be performed on flash memory. A pass-

word is canceled when flash memory is all initialized to 0xFF.

• Password authentication

If there is data other than 0xFF in any one byte of data written to the address 0xFFE0 through

0xFFFF of the TMP89FS60, a product is considered a non-blank product, and password

authentication is required to execute an operation command. In this password authentication

process, PNSA, PCSA and a password string are used. An operation command is executed only

if a password has been successfully authenticated. If a password is unsuccessfully authenti-

cated, the TMP89FS60 goes into an idle state.

If all data written to the address 0xFFE0 through 0xFFFF are 0xFF, a product is considered

blank, and no password authentication is performed. To execute some special operation com-

mands, however, PNSA and PCSA are still required (a password string is not required) even if

a product is blank. In this case, the addresses defined in Table 22-21 must be selected as PNSA

and PCSA.

Whether a product is blank or non-blank can be confirmed by executing the status output

command.

The operation commands that require PNSA and PCSA (password string) for them to be exe-

cuted are as follows:

- Flash memory erase command (0xF0)

- Flash memory write command (0x30)

- Flash memory read command (0x40)

- RAM loader command (0x60)

- Flash memory security setting command (0xFA)

22.12.1.4Password values and setting range

A password must be set in accordance with the conditions shown in Table 22-21. If a password created

without meeting these conditions is used, a password error occurs. In this case, the TMP89FS60 does not

transmit data and goes into an idle state.

Table 22-21 Password Values and Setting Range

Password

Blank product (note 1)

Non-blank product

PNSA

(password count storage address)

0x1000

≤ PNSA ≤ 0xFEFF

0x1000

≤ PNSA ≤ 0xFEFF

PCSA

(password comparison start

address)

0x1000

≤ PCSA ≤ 0xFEFF

0x1000

≤ PCSA ≤ 0xFF00 - N

(password count)

≤ N

Password string

Not required (notes 4 and 5)

Required (note 3)

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