R01UH0823EJ0100 Rev.1.00 Page 1710 of 1823
Jul 31, 2019
RX23W Group 50. Flash Memory (FLASH)
50.9.2 ROM Code Protection
ROM code protection prevents the flash memory from being read or rewritten by the third party when the parallel
programmer is used.
Table 50.15 lists the specifications of ROM code protection.
The ROM code in the flash memory is 32-bit data that is allocated in block 0 of the user area.
Figure 50.30 shows the ROM code configuration. Set ROM code in 32-bit units.
When unlocking ROM code protection, erase block 0 of the user area in boot mode or by self-programming.
Figure 50.30 ROM Code Configuration
Table 50.15 ROM Code Protection Specification
ROM Code Protection Operation When Parallel Programmer is Connected
0000 0000h Enabled Disable reading and rewriting of the user area and data area.
0000 0001h Enabled Disable reading of the user area and data area.
Other than above Disabled Enable reading and rewriting of the user area and data area.
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