SH7144 Datasheet, PDF (387/773 Pages) Renesas Technology Corp – Hitachi SuperH RISC engine

POE Timing
Figure 11.117 shows an example of timing from POE input to high impedance of pin.
CK
input
CK falling
Falling edge detected
PE9/
TIOC3B
High impedance state
Note: Other large-current pins (PE11/TIOC3D, PE12/TIOC4A, PE13/TIOC4B/
, PE14/TIOC4C,
PE15/TIOC4D/
) also goes to the high impedance state at the same timing
Figure 11.117 Falling Edge Detection Operation
11.9.5 Usage Note
Make sure to set the input to the POE pin high, before detecting the level of the POE pin.
Rev. 2.0, 09/02, page 347 of 732