Datasheet

78K0/Ix2 CHAPTER 24 OPTION BYTE
R01UH0010EJ0500 Rev.5.00 649
Feb 28, 2012
Figure 24-1. Format of Option Byte (2/3)
Address: 0081H/1081H
Notes 1, 2
7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 LVISTART
LVISTART LVI default start operation control
0 LVI is OFF by default upon power application (LVI default start function stopped)
1 LVI is ON by default upon power application (LVI default start function enabled)
Notes 1. LVISTART can only be written by using a dedicated flash memory programmer. It cannot be set during
self-programming or boot swap operation during self-programming. However, because the value of 1081H
is copied to 0081H during the boot swap operation, it is recommended to set a value that is the same as
that of 0081H to 1081H when the boot swap function is used.
2. To change the setting for the LVI default start, set the value to 0081H again after batch erasure (chip
erasure) of the flash memory. The setting cannot be changed after the memory of the specified block is
erased.
Caution Be sure to clear bits 7 to 1 to “0”.
Address: 0082H/1082H
Note
7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 R4M8MSEL
R4M8MSEL Internal high-speed oscillation clock frequency selection
0 8 MHz (TYP.)
1 4 MHz (TYP.)
Note Set a value that is the same as that of 0082H to 1082H because 0082H and 1082H are switched during the boot
swap operation.
Caution Be sure to clear bits 7 to 1 to “0”.