R01UH0822EJ0100 Rev.1.00
Page 527 of 1041
Jul 31, 2019
RX13T Group
20. Port Output Enable 3 (POE3C)
20.
Port Output Enable 3 (POE3C)
This MCU incorporates a port output enable 3 (POE3C) which can be used to, under various conditions, disable output
signals for the MTU. Every output signal is put in the high-impedance state when the output is disabled.
In this section, “PCLK” is used to refer to PCLKB.
20.1
Overview
lists the specifications of the POE, and
shows a block diagram of the POE.
The POE has input-level detection circuits, output-level comparison circuits, and a high-impedance request/interrupt
request generating circuit as shown in
.
Table 20.1
POE Specifications
Item
Description
Pin status while output is
disabled
High-impedance
Target pins for switching
to high-impedance state
MTU output pins
MTU0 pins (MTIOC0A, MTIOC0B, MTIOC0C, MTIOC0D)
MTU3 pins (MTIOC3B, MTIOC3D)
MTU4 pins (MTIOC4A, MTIOC4B, MTIOC4C, MTIOC4D)
Generating conditions of
request for switching to
high-impedance state
Input signal detection: Detection of the POE0#, POE8#, and POE10# signal level.
Simultaneous conduction between output pins: A match (simultaneous conduction) between the output
signal levels at the active level over one or more cycles on the following combination of pins
MTU Complementary PWM Output Pins
1
MTIOC3B and MTIOC3D
2
MTIOC4A and MTIOC4C
3
MTIOC4B and MTIOC4D
The SPOER register setting
Detection that the main clock oscillator had stopped oscillating
Detection of the comparator C (CMPC) outputs
Function
Each of the POE0#, POE8#, and POE10# input pins can be set for falling edge, PCLK/8 × 16, PCLK/16 ×
16, or PCLK/128 × 16 low-level sampling.
The outputs of the target pins can be in the high-impedance state by falling-edge or low-level sampling of
the POE0#, POE8#, or POE10# pin.
The outputs of the target pins can be in the high-impedance state when oscillation stop is detected by the
oscillation stop detection function of the clock generator.
The MTU complementary PWM outputs can be in the high-impedance state when output levels of the
MTU complementary PWM output pins are compared and simultaneous active-level output continues for
one cycle or more.
The outputs of the target pins can be in the high-impedance state in response to comparator C (CMPC)
output detection.
The outputs of the target pins can be in the high-impedance state by modifying the settings of the POE
registers.
Interrupts can be generated by input-level sampling or output-level comparison results.