When using the RX62N, RX621, RX62T, or RX62G, it is not necessary to enable the input buffer control bit of the Input Buffer Control Register (ICR) for a POE terminal input setting. This, however, does not apply to the RX610.
Also, the following peripheral modules do not require ICR settings:
(1) RX62N, RX621 - data bus input, NMI, and POE pin inputs
(2) RX62T, RX62G - NMI, and POE pin inputs
For the input buffer control, see “Input Buffer Control Register (ICR)” and "Settings of Ports" description in the “I/O ports” section of their respective user’s manual.