SH7047 Datasheet, PDF (346/764 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTMRISC engine Family/SH7000 Series

10.9 Port Output Enable (POE)
The port output enable (POE) can be used to establish a high-impedance state for high-current
pins, by changing the POE0–POE3 pin input, depending on the output status of the high-current
pins (PE9/TIOC3B, PE11/TIOC3D, PE12/TIOC4A, PE13/TIOC4B/MRES, PE14/TIOC4C,
PE15/TIOC4D/IRQOUT). It can also simultaneously generate interrupt requests.
The high-current pins also become high-impedance regardless of whether these pin functions are
selected in cases such as when the oscillator stops or in standby mode.
10.9.1 Features
• Each of the POE0–POE3 input pins can be set for falling edge, Pφ/8 × 16, Pφ/16 × 16, or
Pφ/128 × 16 low-level sampling.
• High-current pins can be set to high-impedance state by POE0–POE3 pin falling-edge or low-
level sampling.
• High-current pins can be set to high-impedance state when the high-current pin output levels
are compared and simultaneous low-level output continues for one cycle or more.
• Interrupts can be generated by input-level sampling or output-level comparison results.
Rev. 2.00, 09/04, page 306 of 720