Section 10 Port Output Enable (POE)
Rev. 3.00 Sep. 27, 2007 Page 397 of 758
REJ09B0243-0300
P
φ
POE
input
PE9/TIOC3B
P
φ
rising edge
Falling edge detection
High-impedance state
*
Note:
*
The other high-current pins also enter the high-impedance state in the similar timing.
Figure 10.2 Falling Edge Detection
(2) Low-Level
Detection
Figure 10.3 shows the low-level detection operation. Sixteen continuous low levels are sampled
with the sampling clock selected by ICSR1. If even one high level is detected during this interval,
the low level is not accepted.
The timing when the high-current pins enter the high-impedance state after the sampling clock is
input is the same in both falling-edge detection and in low-level detection.
P
φ
Sampling
clock
3
POE
input
PE9/
TIOC3B
When low level is
sampled at all points
When high level is
sampled at least once
Flag set
(
POE
received)
Flag not set
High-impedance
state
*
Note:
*
Other high-current pins also go to the high-impedance state at the same timing.
2
1
2
1
16
13
8/16/128 clock
cycles
Figure 10.3 Low-Level Detection Operation
Содержание SH7124 R5F7124
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