Fujitsu FR81S Manual Do Utilizador
CHAPTER 11: I/O PORTS
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : I/O PORTS
FUJITSU SEMICONDUCTOR CONFIDENTIAL
66
5.10. Notes on switching the I/O port function
Notes on switching the I/O port function is shown below.
When the port function is changed (general purpose port to peripheral function or peripheral function to
general purpose port), it has possibilities that port outputs short spike.
Short spike is the same logic level as PDR value.
It is happened in the case of switching with direction change.
If this output is critical for the system, please set the certain value on PDR in prior to change port function.
MB91520 Series
MN705-00010-1v0-E
461