upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 382

• Manufacturer Part Number: upd78f0124hgba1-8et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

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23.1 Functions of Option Bytes
the device is restarted from the reset status, the device automatically references the option bytes and sets specified
functions. When using the product, be sure to set the following functions by using the option bytes.
Therefore, set values that are the same as those of 0080H to 0084H to 1080H to 1084H in advance.
(1) 0080H/1080H
(2) 0084H/1084H
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The flash memory at 0080H to 0084H of the 78K0/KD1+ is an option byte area. When power is turned on or when
When the boot swap operation is used during self-programming, 0080H to 0084H are switched to 1080H to 1084H.
Caution Be sure to set 00H to 0081H, 0082H, and 0083H (0081H/1081H, 0082H/1082H, and 0083H/1083H
Cautions 1. Be sure to set 00H (disabling on-chip debug operation) to 0084H for products not equipped
Internal oscillator operation
• Can be stopped by software
• Cannot be stopped
On-chip debug operation control
• Disabling on-chip debug operation
• Enabling on-chip debug operation and erasing data of the flash memory in case authentication of the on-
• Enabling on-chip debug operation and not erasing data of the flash memory even in case authentication of
chip debug security ID fails
the on-chip debug security ID fails
when the boot swap function is used).
2. To use the on-chip debug function with a product equipped with the on-chip debug function
with the on-chip debug function (
1084H because 0084H and 1084H are switched at boot swapping.
(
1084H because 0084H and 1084H are switched at boot swapping.
µ
PD78F0124HD), set 02H or 03H to 0084H. Set a value that is the same as that of 0084H to
CHAPTER 23 OPTION BYTE
User’s Manual U16962EJ3V0UD
µ
PD78F0122H, 78F0123H, and 78F0124H). Also set 00H to