SH7147 Datasheet, PDF (513/1108 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 11 Port Output Enable (POE)
Section 11 Port Output Enable (POE)
The port output enable (POE) module can be used to place the special pins of the MTU2 and
MTU2S (pins multiplexed with TIOC3B, TIOC3D, TIOC4A, TIOC4B, TIOC4C, and TIOC4D in
the MTU2 and TIOC3BS, TIOC3DS, TIOC4AS, TIOC4BS, TIOC4CS, and TIOC4DS in the
MTU2S) and the pins for channel 0 of the MTU2 (pins multiplexed with TIOC0A, TIOC0B,
TIOC0C, and TIOC0D) in the high-impedance state, depending on the change on POE0 to POE2,
POE4 to POE6, and POE8 input pins, the output status of the special pins of the MTU2 and
MTU2S, or by register settings. It can also generate interrupt requests at the same time.
11.1 Features
• Each of the POE0 to POE2, POE4 to POE6, and POE8 input pins can be set for falling edge,
Pφ/8 × 16, Pφ/16 × 16, or Pφ/128 × 16 low-level sampling.
• Special pins of the MTU2 and MTU2S and the pins for channel 0 of the MTU2 can be placed
in the high-impedance state on the falling edge or low-level sampling of the POE0 to POE2,
POE4 to POE6, and POE8 pins.
• Output levels on the special pins of the MTU2 and MTU2S are compared and if active-level
outputs continue on multiple pins simultaneously for one cycle or more for Pφ, the special pins
of the MTU2 and MTU2S can be placed in the high-impedance state.
• Special pins of the MTU2 and MTU2S and the pins for channel 0 of the MTU2 can be placed
in the high-impedance state by modifying the POE register setting.
• Interrupts can be generated by input-level sampling or output-level comparison results.
The POE has input level detection circuits, output level comparison circuits, and a high-impedance
request/interrupt request generating circuit as shown in figure 11.1.
In addition to control by the POE, special pins of the MTU2 and MTU2S can be placed in the
high-impedance state when the oscillator stops or in software standby state. For details, refer to
appendix A, Pin States.
Rev. 3.00 Oct. 06, 2008 Page 489 of 1080
REJ09B0230-0300