upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 447

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

18.1
when 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) 0081H/1081H
(3) 0084H/1084H
The flash memory at 0080H to 0084H of the
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 0082H and 0083H (0082H/1082H and 0083H/1083H when the boot swap
Caution To use the on-chip debug function with a product equipped with the on-chip debug function
Caution For the
Internal low-speed oscillator operation
• Can be stopped by software
• Cannot be stopped
Watchdog timer interval time setting
Watchdog timer counter operation
• Enabled counter operation
• Disabled counter operation
Watchdog timer window open period setting
Selecting POC mode
• During 2.7 V/1.59 V POC mode operation (POCMODE = 1)
• During 1.59 V POC mode operation (POCMODE = 0)
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
Functions of Option Bytes
The device is in the reset state upon power application and until the supply voltage reaches 2.7 V (TYP.). It
is released from the reset state when the voltage exceeds 2.7 V (TYP.). After that, POC is not detected at
2.7 V but is detected at 1.59 V (TYP.).
The device is in the reset state upon power application and until the supply voltage reaches 1.59 V (TYP.).
It is released from the reset state when the voltage exceeds 1.59 V (TYP.). After that, POC is detected at
1.59 V (TYP.), in the same manner as on power application.
chip debug security ID fails
the on-chip debug security ID fails
function is used).
(
because 0084H and 1084H are switched at boot swapping.
µ
PD78F0730), set 02H or 03H to 0084H. Set a value that is the same as that of 0084H to 1084H
µ
PD78F0730, be sure to set POCMODE to 1.
CHAPTER 18 OPTION BYTE
Preliminary User’s Manual U19014EJ1V0UD
µ
PD78F0730 is an option byte area. When power is turned on or
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