m30833fjgp Renesas Electronics Corporation., m30833fjgp Datasheet - Page 419
m30833fjgp
Manufacturer Part Number
m30833fjgp
Description
Renesas 16/32-bit Single-chip Microcomputer M16c Family / M32c/80 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.M30833FJGP.pdf
(527 pages)
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25.3.1.4 FMR03 Bit
25.3.1.5 FMR05 Bit
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25.3.1.3 FMR02 Bit
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0
The lock bit set for each block can be disabled by setting the FMR02 bit to "1" (lock bit disabled).
(Refer to 25.3.3 Data Protect Function.) The lock bit is enabled by setting the FMR02 bit to "0" (lock
bit enabled). The FMR02 bit can be set when the FMR01 bit is set to "1". To set the FMR02 bit to "1",
set it to "1" immediately after setting it to "0". To set the FMR02 bit to "0", set it to "0".
The FMR02 bit does not change the lock bit state, but disables the lock bit function. If the block erase
or erase all unlocked block command is executed while the FMR02 bit is set to "1", the lock bit state
changes "0" (locked) to "1" (unlocked) after command execution is completed.
By setting the FMR03 bit to "0" following "1", access to the user ROM area is interrupted to reset the
flash memory control circuit. The flash memory enters read array mode after reset. The FMR00 bit is
set to "1" (READY) and the Status register is set to "80
When the FMR03 bit resets the flash memory control circuit during an auto write or auto erase opera-
tion, an auto write or auto erase operation is interrupted. Data in the block is invalid.
To set the FMR03 bit to "0", set it to "0" immediately after setting it to "1".
The FMR05 bit selects the boot ROM or user ROM area in boot mode. Set to "0" to access (read) the
boot ROM area or to "1" (user ROM access) to access (read, write or erase) the user ROM area.
Execute an instruction written to the FMR05 bit in a space (internal RAM, etc.) other than the flash
memory.
In modes other than boot mode, the user ROM area is accessed (read) regardless of the FMR05 bit
setting.
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Page 396
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25. Flash Memory Version
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