Section 10 Port Output Enable (POE)
TIMMTU1A_020020030800
Rev. 3.00 Sep. 27, 2007 Page 381 of 758
REJ09B0243-0300
Section 10 Port Output Enable (POE)
The port output enable (POE) can be used to place the high-current pins (pins multiplexed with
TIOC3B, TIOC3D, TIOC4A, TIOC4B, TIOC4C, and TIOC4D in the MTU2) and the pins for
channel 0 of the MTU2 (pins multiplexed with TIOC0A, TIOC0B, TIOC0C, and TIOC0D) in
high-impedance state, depending on the change on
POE0
,
POE1
,
POE3
*, and
POE8
input pins
and the output status of the high-current pins, or by modifying register settings. It can also
simultaneously generate interrupt requests.
10.1 Features
•
Each of the
POE0
,
POE1
,
POE3
*, and
POE8
input pins can be set for falling edge, P
φ
/8
×
16,
P
φ
/16
×
16, or P
φ
/128
×
16 low-level sampling.
•
High-current pins and the pins for channel 0 of the MTU2 can be placed in high-impedance
state by
POE0
,
POE1
,
POE3
*, and
POE8
pin falling-edge or low-level sampling.
•
High-current pins can be placed in high-impedance state when the high-current pin output
levels are compared and simultaneous active-level output continues for one cycle or more.
•
High-current pins and the pins for channel 0 of the MTU2 can be placed in high-impedance
state by modifying the POE register settings.
•
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 10.1, Block Diagram of POE.
In addition to control by the POE, high-current pins can be placed in high-impedance state when
the oscillator stops or in software standby state. For details, refer to appendix A, Pin States.
Note: * The
POE3
pin is supported only by the SH7125.
Содержание SH7124 R5F7124
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