TMP89FS60 datasheet(369/410 Pages) TOSHIBA

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Page 355

TMP89FS60

RA002

22.10Checksum (SUM)

For the following operation commands, a checksum is returned to verify the appropriateness of the result of com-

mand execution:

- Flash memory erase command (0xF0)

- Flash memory write command (0x30)

- Flash memory SUM output command (0x30)

- Flash memory read command (0x40)

- RAM loader command (0x60)

- Product ID code output command (0xC0)

- Flash memory status output command (0xC3)

22.10.1Calculation method

The checksum (SUM) is calculated with the sum of all bytes, and the obtained result is returned as a word.

The data is read in single-byte units, and the calculated result is returned as a word.

Example:

In the case of the product ID code output command and flash memory status output command, however, a

different calculation method is used. For more information, refer to Table 22-19.

22.10.2Calculation data

Table 22-19 shows the data for which a checksum is calculated for each command.

0xA1

If the data to be calculated consists of four bytes as shown

on the left, the checksum of the data is as follows:

0xB2

0xA1 + 0xB2 + 0xC3 + 0xD4 = 0x02EA

SUM (HIGH)= 0x02

SUM (LOW)= 0xEA

0xC3

0xD4

Table 22-19 Data for which a Checksum Is Calculated

Operation command

Calculation data

Description

Flash memory erase command

All data in the erased area of flash mem-

ory (whole or part of flash memory)

When the sector erase is executed, only the erased area is

used to calculate the checksum. In the case of the chip erase,

an entire area of the flash memory is used.

Flash memory write command

Data in the entire area of flash memory

Even if a part of the flash memory is written, the checksum of

the entire flash memory area (0x1000 to 0xFFFF) is calcu-

lated. The data length, address, record type and checksum in

Intel Hex format are not included in the checksum.

Flash memory SUM output com-

mand

Flash memory read command

Data in the read area of flash memory

RAM loader command

RAM data written in the first received

RAM address through the last received

RAM address

The length of data, address, record type and checksum in Intel

Hex format are not included in the checksum.

Product ID code output command

9th through 18th bytes of transferred data

For details, refer to "22.8.6 Product ID code output command

(operation command: 0xC0)".

Flash memory status output com-

mand

9th through 12th bytes of transferred data

For details, refer to Table "Table 22-14 Flash Memory Status

Output Commands".

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