SH7101 datasheet(302/560 Pages) RENESAS

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Section 8 Multifunction Timer Pulse Unit (MTU)

Rev.1.00 Sep. 18, 2008 Page 268 of 522

REJ09B0069-0100

8.9.4

Operation

Input Level Detection Operation

If the input conditions set by the ICSR1 occur on any of the

POE pins, all high-current pins

become high-impedance state. However, only when the general input/output function or MTU

function is selected, the large-current pin is in the high-impedance state.

Falling Edge Detection: When a change from high to low level is input to the

POE pins.

Low-Level Detection: Figure 8.114 shows the low-level detection operation. Sixteen continuous

low levels are sampled with the sampling clock established by the ICSR1. If even one high level is

detected during this interval, the low level is not accepted.

Furthermore, the timing when the large-current pins enter the high-impedance state from the

sampling clock is the same in both falling-edge detection and in low-level detection.

Sampling

clock

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 large-current pins (PE11/TIOC3D, PE12/TIOC4A, PE13/TIOC4B/

MRES, PE14/TIOC4C,

PE15/TIOC4D/

IRQOUT) also go to the high-impedance state at the same timing.

8/16/128 clock

cycles

Figure 8.114 Low-Level Detection Operation

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