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RL78/G1P
CHAPTER 22 OPTION BYTE
R01UH0895EJ0100 Rev.1.00
662
Nov 29, 2019
CHAPTER 22 OPTION BYTE
22.1 Functions of Option Bytes
Addresses 000C0H to 000C3H of the flash memory of the RL78/G1P 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.
For the bits to which no function is allocated, do not change their initial values.
22.1.1 User option byte (000C0H to 000C2H)
(1) 000C0H
Operation of watchdog timer
Enabling or disabling of counter operation.
Operation is stopped or enabled in the HALT or STOP mode.
Setting of interval time of watchdog timer
Setting of window open period of watchdog timer
Setting of interval interrupt of watchdog timer
Used or not used
(2) 000C1H
Setting of LVD operation mode
Interrupt & reset mode.
Reset mode.
Interrupt mode.
LVD off (external reset input from the RESET
___________
pin is used).
Setting of LVD detection level (V
LVDH
, V
LVDL
, V
LVD
)
(3) 000C2H
Setting of flash operation mode
LS (low-speed main) mode
HS (high-speed main) mode
Setting of the frequency of the high-speed on-chip oscillator
Select from 1 MHz, 4 MHz, 8 MHz, 12 MHz, 16 MHz, 24 MHz, and 32 MHz.
22.1.2 On-chip debug option byte (000C3H)
Control of on-chip debug operation
On-chip debug operation is disabled or enabled.
Handling of data of flash memory in case of failure in on-chip debug security ID authentication
Data of flash memory is erased or not erased in case of failure in on-chip debug security ID authentication.