TMP86FS28DFG datasheet(237/272 Pages) TOSHIBA

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Page 225

TMP86FS28DFG

18.5 Operation Command

The eight commands shown in Table 18-6 are used in the serial PROM mode. After reset release, the

TMP86FS28DFG waits for the matching data (5AH).

Note 1: TMP86FS28DFG doesn’t support RAM loader mode.

18.6 Operation Mode

The serial PROM mode has six types of modes, that are (1) Flash memory erasing, (2) Flash memory writing, (3)

Flash memory SUM output, (4) Product ID code output, (5) Flash memory status output and (6) 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, TMP86FS28DFG 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,

TMP86FS28DFG 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 memory eras-

ing mode. Before activating the flash memory writing mode, TMP86FS28DFG checks the password except

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

3. 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.

4. 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 TMP86FS28DFG, the addresses from 1000H to FFFFH become the ROM area.)

5. Flash memory status output mode

The status of the area from FFE0H to FFFFH, and the read protection condition are output as 7-byte code.

The external controller reads this code to recognize the flash memory status.

6. Flash memory read protection setting mode

This mode disables reading the flash memory data in parallel PROM mode. In the serial PROM mode, the

flash memory writing mode is disabled. To disable the flash memory read protection, perform the chip

erase in the flash memory erasing mode.

Table 18-6 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).

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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