RL78/G1H CHAPTER 28 ON-CHIP DEBUG FUNCTION
R01UH0575EJ0120 Rev. 1.20 Page 829 of 920
Dec 22, 2016
28.2 On-Chip Debug Security ID
The RL78 microcontroller has an on-chip debug operation control bit in the flash memory at 000C3H (see
CHAPTER 26 OPTION BYTE) and an on-chip debug security ID setting area at 000C4H to 000CDH, to prevent third
parties from reading memory content.
When the boot swap function is used, also set a value that is the same as that of 010C3H and 010C4H to 010CDH
in advance, because 000C3H, 000C4H to 000CDH and 010C3H, and 010C4H to 010CDH are switched.
28.3 Securing of User Resources
To perform communication between the RL78 microcontroller and E1 on-chip debugging emulator, as well as each
debug function, the securing of memory space must be done beforehand.
If Renesas Electronics assembler or compiler is used, the items can be set by using link options.
(1) Securement of memory space
The shaded portions in Figure 28 - 2 are the areas reserved for placing the debug monitor program, so user
programs or data cannot be allocated in these spaces. When using the on-chip debug function, these spaces
must be secured so as not to be used by the user program. Moreover, this area must not be rewritten by the user
program.
Table 28 - 1 On-Chip Debug Security ID
Address On-Chip Debug Security ID
000C4H to 000CDH Any ID code of 10 bytes
010C4H to 010CDH
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