TMP86FS49AIUG datasheet(255/296 Pages) TOSHIBA

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Page 239

TMP86FS49AIUG

20.5 Operation Command

The eight commands shown in Table 20-6 are used in the serial PROM mode. After reset release, the

TMP86FS49AIUG waits for the matching data (5AH).

20.6 Operation Mode

The serial PROM mode has seven types of modes, that are (1) Flash memory erasing, (2) Flash memory writing,

(3) RAM loader, (4) Flash memory SUM output, (5) Product ID code output, (6) Flash memory status output and (7)

Flash memory read protection setting modes. Description of each mode is shown below.

1. Flash memory erasing mode

The flash memory is erased by the chip erase (erasing an entire flash area) or sector erase (erasing sectors in

4-kbyte units). The erased area is filled with FFH. When the read protection is enabled, the sector erase in

the flash erasing mode can not be performed. To disable the read protection, perform the chip erase. Before

erasing the flash memory, TMP86FS49AIUG checks the passwords except a blank product. If the password

is not matched, the flash memory erasing mode is not activated.

2. Flash memory writing mode

Data is written to the specified flash memory address for each byte unit. The external controller must trans-

mit the write data in the Intel Hex format (Binary). If no error is encountered till the end record,

TMP86FS49AIUG calculates the checksum for the entire flash memory area (1000H to FFFFH), and

returns the obtained result to the external controller. When the read protection is enabled, the flash memory

writing mode is not activated. In this case, perform the chip erase command beforehand in the flash mem-

ory erasing mode. Before activating the flash memory writing mode, TMP86FS49AIUG checks the pass-

word except a blank product. If the password is not matched, flash memory writing mode is not activated.

3. RAM loader mode

The RAM loader transfers the data in Intel Hex format sent from the external controller to the internal

RAM. When the transfer is completed normally, the RAM loader calculates the checksum. After transmit-

ting the results, the RAM loader jumps to the RAM address specified with the first data record in order to

execute the user program. When the read protection is enabled, the RAM loader mode is not activated. In

this case, perform the chip erase beforehand in the flash memory erasing mode. Before activating the RAM

loader mode, TMP86FS49AIUG checks the password except a blank product. If the password is not

matched, flash RAM loader mode is not activated.

4. Flash memory SUM output mode

The checksum is calculated for the entire flash memory area (1000H to FFFFH), and the result is returned

to the external controller. Since the BOOTROM does not support the operation command to read the flash

memory, use this checksum to identify programs when managing revisions of application programs.

5. Product ID code output

The code used to identify the product is output. The code to be output consists of 13-byte data, which

includes the information indicating the area of the ROM incorporated in the product. The external control-

ler reads this code, and recognizes the product to write.

(In the case of TMP86FS49AIUG, the addresses from 1000H to FFFFH become the ROM area.)

Table 20-6 Operation Command in the Serial PROM Mode

Command Data

Operating Mode

Description

5AH

Setup

Matching data. Execute this command after releasing the reset.

F0H

Flash memory erasing

Erases the flash memory area (address 1000H to FFFFH).

30H

Flash memory writing

Writes to the flash memory area (address 1000H to FFFFH).

60H

RAM loader

Writes to the specified RAM area (address 0050H to 083FH).

90H

Flash memory SUM output

Outputs the 2-byte checksum upper byte and lower byte in this order for the

entire area of the flash memory (address 1000H to FFFFH).

C0H

Product ID code output

Outputs the product ID code (13-byte data).

C3H

Flash memory status output

Outputs the status code (7-byte data) such as the read protection condition.

FAH

Flash memory read protection setting

Enables the read protection.

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