tmp89fh40 TOSHIBA Semiconductor CORPORATION, tmp89fh40 Datasheet - Page 385

• Manufacturer Part Number: tmp89fh40
• Description: 8 Bit Microcontroller Tlcs-870/c1 Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

RA003
22.10
22.10.1
22.10.2
Table 22-19 Data for which a Checksum Is Calculated
Flash memory erase command
Flash memory write command
Flash memory SUM output com-
mand
Flash memory read command
RAM loader command
Product ID code output command
Flash memory status output com-
mand
mand execution:
For the following operation commands, a checksum is returned to verify the appropriateness of the result of com-
Operation command
-
-
-
-
-
-
-
The data is read in single-byte units, and the calculated result is returned as a word.
different calculation method is used. For more information, refer to Table 22-19.
Checksum (SUM)
The checksum (SUM) is calculated with the sum of all bytes, and the obtained 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
Table 22-19 shows the data for which a checksum is calculated for each command.
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)
Calculation method
Calculation data
All data in the erased area of flash memory
(whole or part of flash memory)
Data in the entire area of flash memory
Data in the read area of flash memory
RAM data written in the first received RAM
address through the last received RAM ad-
dress
9th through 18th bytes of transferred data
9th through 12th bytes of transferred data
0xC3
0xD4
0xA1
0xB2
Calculation data
If the data to be calculated consists of four bytes as shown
on the left, the checksum of the data is as follows:
0xA1 + 0xB2 + 0xC3 + 0xD4 = 0x02EA
SUM (HIGH)= 0x02
SUM (LOW)= 0xEA
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In the case of the chip erase, an entire area of the flash memory
is used. When the sector erase is executed, only the erased
area is used to calculate the checksum.
Even if a part of the flash memory is written, the checksum of
the entire flash memory area (0xC000 to 0xFFFF) is calculated.
The data length, address, record type and checksum in Intel Hex
format are not included in the checksum.
The length of data, address, record type and checksum in Intel
Hex format are not included in the checksum.
For details, refer to "22.8.6 Product ID code output command
(operation command: 0xC0)".
For details, refer to Table "Table 22-14 Flash Memory Status
Output Commands".
Description
TMP89FH40