tmp88ch41ug TOSHIBA Semiconductor CORPORATION, tmp88ch41ug Datasheet - Page 190

• Manufacturer Part Number: tmp88ch41ug
• Description: 8 Bit Microcontroller Tlcs-870/x Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

18.3 Toggle Bit (D6)
18. Flash Memory
18.3 Toggle Bit (D6)
18.4 Access to the Flash Memory Area
18.2.5 Product ID Exit
18.2.6 Read Protect
read from the same address is reversed bit 6 (D6) of the data (toggling between 0 and 1) until the operation is com-
pleted. Therefore, this toggle bit provides a software mechanism to check the completion of each operation. Usually
perform read operations repeatedly for data polling until the same data is read twice from the same address in the
flash memory. After the byte program, chip erase, or read protect command sequence is executed, the initial read of
the toggle bit always produces a "1".
formed in the entire flash memory area. Therefore, to perform these operations in the entire flash memory area,
access to the flash memory area by the control program in the BOOTROM or RAM area. (The flash memory pro-
gram cannot write to the flash memory.) The serial PROM or MCU mode is used to run the control program in the
BOOTROM or RAM area.
After the byte program, chip erase, and read protect command sequence is executed, any consecutive attempts to
When the write, erase and read protections are set in the flash memory, read and fetch operations cannot be per-
the flash memory cannot be read in the parallel PROM mode. In the serial PROM mode, the flash write and
RAM loader commands cannot be executed.
or not the read protection is enabled can be checked by reading 04F7FH in the Product ID mode. For details,
see Table 18-2.
be executed until this operation is completed. To check the completion of the read protect operation, perform
read operations repeatedly for data polling until the same data is read twice from the same address in the flash
memory. During the read protect operation, any attempts to read from the same address is reversed bit 6 of the
data (toggling between 0 and 1).
This command is used to exit the Product ID mode.
This command enables the read protection setting in the flash memory. When the read protection is enabled,
To disable the read protection setting, it is necessary to execute the chip erase command sequence. Whether
It takes a maximum of 40 µs to set read protection in the flash memory. The next command sequence cannot
Table 18-2 Values To Be Read in the Product ID Mode
Cell
1
Address
04F7FH
04000H
04001H
04002H
Read protection status
Flash macro ID
Vendor ID
Flash size
Meaning
Page 180
98H
41H
0EH:
0BH:
07H:
05H:
03H:
01H:
00H:
FFH:
Other than FFH: Read protection enabled
60 kbytes
48 kbytes
32 kbytes
24 kbytes
16 kbytes
8 kbytes
4 kbytes
Read protection disabled
Read Value
TMP88FH41UG