Renesas R61509V - Manual (Page 161)

R61509V Target Spec
Rev. 0.11 April 25, 2008, page 161 of 181
Notes to Power Supply ON Sequence
When voltages do not rise in the order of VCC, IOVCC and then VCI and have to change the order, please
follow the following note.
Note
Internal operation of the R61509V is unstable until VCC rises. If IOVCC rose before VCC rises, the
R61509V may be in “output” status. In this case, do not send or receive any data before power supply is
completed.
Changing order of voltage input will not cause troubles such as latchup or destruction of the LSI.