SH7144 Datasheet, PDF (379/773 Pages) Renesas Technology Corp – Hitachi SuperH RISC engine

The POE has input-level detection circuitry and output-level detection circuitry, as shown in the
block diagram of figure 11.114.
TIOC3B
TIOC3D
TIOC4A
TIOC4C
TIOC4B
TIOC4D
Output level
detection circuit
Output level
detection circuit
Output level
detection circuit
OCSR
ICSR1
Input level detection circuit
Falling-edge
detection circuit
Low-level
detection circuit
High-
impedance
request control
signal
Interrupt request
φ/8
φ/16
φ/128
Legend:
OCSR: Output level control/status register
ICSR1: Input level control/status register
Figure 11.114 POE Block Diagram
Rev. 2.0, 09/02, page 339 of 732