TMP86FS49AIUG datasheet(264/296 Pages) TOSHIBA

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Page 248

20. Serial PROM Mode

20.6 Operation Mode

TMP86FS49AIUG

20.6.4 Flash Memory SUM Output Mode (Operation Command: 90H)

Table 20-10 shows flash memory SUM output 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 " 20.8 Checksum (SUM) ".

Description of the flash memory SUM output mode

1. The 1st through 4th bytes of the transmitted and received data contains 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 SUM output mode

(90H).

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

this case, 90H). If the 5th byte of the received data does not contain the operation command data, the

device enters the halt condition after transmitting 3 bytes of operation command error code (63H).

4. The 7th and the 8th bytes contain the upper and lower bits of the checksum, respectively. For how to

calculate the checksum, refer to " 20.8 Checksum (SUM) ".

5. After sending the checksum, the device waits for the next operation command data.

Table 20-10 Flash Memory SUM Output Process

Transfer Bytes

Transfer Data from External Control-

ler 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 (90H)

Modified baud rate

OK: Echo back data (90H)

Error: A1H

× 3, A3H × 3, 63H × 3 (Note 1)

7th byte

Modified baud rate

OK: SUM (Upper byte) (Note 2)

Error: Nothing transmitted

8th byte

Modified baud rate

OK: SUM (Lower byte) (Note 2)

Error: Nothing transmitted

9th byte

(Wait for the next operation com-

mand data)

Modified baud rate

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