SH7101 Datasheet, PDF (293/486 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

8. Multi-Function Timer Pulse Unit (MTU)
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.
8/16/128 clock
cycles
Pφ
Sampling
clock
POE input
PE9/
TIOC3B
High-impedance
state*
When low level is
Flag set
sampled at all points ¹
2
3
16 _{(POE received)}
When high level is
sampled at least once
1
2
13 Flag not set
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.
Figure 8.114 Low-Level Detection Operation
Rev.2.00 Sep. 27, 2007 Page 259 of 448
REJ09B0394-0200