Datasheet

78K0/Ix2 CHAPTER 24 OPTION BYTE
R01UH0010EJ0500 Rev.5.00 651
Feb 28, 2012
Here is an example of description of the software for setting the option bytes.
OPT CSEG AT 0080H
OPTION: DB 30H ; Enables watchdog timer operation (illegal access detection operation),
; Window open period of watchdog timer: 50%,
; Overflow time of watchdog timer: 2
7
/fIL,
; Internal low-speed oscillator can be stopped by software.
DB 00H ; LVI default start function stopped
DB 01H ; Internal high-speed oscillation clock frequency 4 MHz (TYP.)
DB 1EH ; Use the TOOLC0/X1, TOOLD0/X2 pins
DB 02H ; Operation enabled. Does not erase data of the flash memory in case
; authentication of the on-chip debug security ID fails.
Remark Referencing of the option byte is performed during reset processing. For the reset processing timing, refer to
CHAPTER 20 RESET FUNCTION.