tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 321

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

RA003
21.2 Functions
21.2.1 Flash memory command sequence execution and toggle control (FLSCR1
<FLSMD>)
execution of the flash memory command sequence and the toggle operation can be disabled (the flash memory
can be write protected) by making an appropriate control register setting (write protect). To enable the execu-
tion of the command sequence and the toggle operation, set FLSCR1<FLSMD> to "0y101", and then set
"0xD5" on FLSCR2<CR1EN>. To disable the execution of the command sequence, set FLSCR1<FLSMD> to
"0y010", and then set "0xD5" on FLSCR2<CR1EN>. If the command sequence or the toggle operation is exe-
cuted with the execution of the command sequence and the toggle operation set to "disable", the executed com-
mand sequence or toggle operation takes no effect.
sequence. FLSCR1<FLSMD> should normally be set to "0y010" except when a write or erase is to be per-
formed on the flash memory.
To prevent inadvertent writes to the flash memory due to program error or microcontroller malfunction, the
After a reset, FLSCR1<FLSMD> is initialized to "0y010" to disable the execution of the command
Note 1: If "0xD5" is set on FLSCR2<CR1EN> with FLSCR1<FLSMD> set to "101", the flash memory goes into an
Note 2: If FLSCR1<FLSMD> is set to "disable", subsequent commands (write instructions) generated are rejected
active state, and MCU consumes the same amount of current as it does during a read.
but a command sequence being executed is not initialized.
If you want to set FLSCR1<FLSMD> to "disable", you must finish all command sequences and verify that
the flash memory is ready to be read.
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