Section 10 Port Output Enable (POE)
Rev. 3.00 Sep. 27, 2007 Page 400 of 758
REJ09B0243-0300
10.6 Usage
Note
10.6.1
Pin State when a Power-On Reset is Issued from the Watchdog Timer
When a power-on reset is issued from the watchdog timer (WDT), initialization of the pin function
controller (PFC) sets initial values that select the general input function for the I/O ports.
However, when a power-on reset is issued from the WDT while a pin is being handled as high
impedance by the port output enable (POE), the pin is placed in the output state for one cycle of
the peripheral clock (Pf), after which the function is switched to general input.
This also occurs when a power-on reset is issued from the WDT for pins that are being handled as
high impedance due to short-circuit detection by the MTU2.
Figure 10.5 shows the state of a pin for which the POE input has selected high impedance
handling with the timer output selected when a power-on reset is issued from the WDT.
Timer output
Pin state
General input
Timer output
General input
High impedance state
Timer
output
1P
φ
cycle
POE
input
P
φ
PFC setting value
Power-on reset by WDT
Figure 10.5 Pin State when a Power-On Reset is Issued from the Watchdog Timer
Summary of Contents for SH7124 R5F7124
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