RL78/G13 CHAPTER 24 OPTION BYTE
R01UH0146EJ0100 Rev.1.00 921
Sep 22, 2011
CHAPTER 24 OPTION BYTE
24.1 Functions of Option Bytes
Addresses 000C0H to 000C3H of the flash memory of the RL78/G13 form an option byte area.
Option bytes consist of user option byte (000C0H to 000C2H) and on-chip debug option byte (000C3H).
Upon power application or resetting and starting, an option byte is automatically referenced and a specified function is
set. When using the product, be sure to set the following functions by using the option bytes.
To use the boot swap operation during self programming, 000C0H to 000C3H are replaced by 010C0H to 010C3H.
Therefore, set the same values as 000C0H to 000C3H to 010C0H to 010C3H.
24.1.1 User option byte (000C0H to 000C2H/010C0H to 010C2H)
(1) 000C0H/010C0H
{ Operation of watchdog timer
• Operation is stopped or enabled in the HALT or STOP mode.
{ Setting of interval time of watchdog timer
{ Operation of watchdog timer
• Operation is stopped or enabled.
{ Setting of window open period of watchdog timer
{ Setting of interval interrupt of watchdog timer
• Used or not used
Caution Set the same value as 000C0H to 010C0H when the boot swap operation is used because
000C0H is replaced by 010C0H.
(2) 000C1H/010C1H
{ Setting of LVD operation mode
• Interrupt & reset mode.
• Reset mode.
• Interrupt mode.
{ Setting of LVD detection level (V
LVIH, VLVIL, VLVI)
Caution Set the same value as 000C1H to 010C1H when the boot swap operation is used because
000C1H is replaced by 010C1H.
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