TMP86FS49AIUG datasheet(268/296 Pages) TOSHIBA

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Page 252

20. Serial PROM Mode

20.6 Operation Mode

TMP86FS49AIUG

20.6.7 Flash Memory Read Protection Setting Mode (Operation Command: FAH)

Table 20-13 shows Flash memory read protection setting mode process.

Note 1: “xxH

× 3” indicates that the device enters the halt condition after sending 3 bytes of xxH. For details, refer to " 20.7 Error

Code ".

Note 2: Refer to " 20.10 Passwords ".

Note 3: If the read protection is enabled for a blank product or a password error occurs for a non-blank product, TMP86FS49AIUG

stops UART communication and enters the halt mode. In this case, initialize TMP86FS49AIUG by the RESET pin and

reactivate the serial PROM mode.

Note 4: If an error occurs during reception of a password address or a password string, TMP86FS49AIUG stops UART communi-

cation and enters the halt mode. In this case, initialize TMP86FS49AIUG by the RESET pin and reactivate the serial PROM

mode.

Description of the Flash memory read protection setting mode

1. The 1st through 4th bytes of the transmitted and received data contain the same data as in the Flash

memory writing mode.

2. The 5th byte of the received data contains the command data in the flash memory status output mode

(FAH).

3. When the 5th byte of the received data contains the operation command data shown in Table 1-6, the

device echoes back the value which is the same data in the 6th byte position of the received data (in

Table 20-13 Flash Memory Read Protection Setting Mode Process

Transfer Bytes

Transfer Data from External Con-

troller to TMP86FS49AIUG

Baud Rate

Transfer Data from TMP86FS49AIUG to

External Controller

BOOT

ROM

1st byte

2nd byte

Matching data (5AH)

9600 bps

- (Automatic baud rate adjustment)

OK: Echo back data (5AH)

Error: Nothing transmitted

3rd byte

4th byte

Baud rate modification data

(See Table 20-4)

9600 bps

OK: Echo back data

Error: A1H

× 3, A3H × 3, 62H × 3 (Note 1)

5th byte

6th byte

Operation command data (FAH)

Modified baud rate

OK: Echo back data (FAH)

Error: A1H

× 3, A3H × 3, 63H × 3 (Note 1)

7th byte

8th byte

Password count storage address

15 to 08 (Note 2)

Modified baud rate

OK: Nothing transmitted

Error: Nothing transmitted

9th byte

10th byte

Password count storage address

07 to 00 (Note 2)

Modified baud rate

OK: Nothing transmitted

Error: Nothing transmitted

11th byte

12th byte

Password comparison start

address 15 to 08 (Note 2)

Modified baud rate

OK: Nothing transmitted

Error: Nothing transmitted

13th byte

14th byte

Password comparison start

address 07 to 00 (Note 2)

Modified baud rate

OK: Nothing transmitted

Error: Nothing transmitted

15th byte

m’th byte

Password string (Note 2)

Modified baud rate

OK: Nothing transmitted

Error: Nothing transmitted

n’th byte

Modified baud rate

OK: FBH (Note 3)

Error: Nothing transmitted

n’+1th byte

(Wait for the next operation com-

mand data)

Modified baud rate

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