RH850/F1K Series Hardware Design Guide
R01AN2911EJ0100 Rev. 1.00 Page 22 of 46
Aug 04, 2016
4.2.5 Behavior during Low Power Mode
During the low power modes, different states apply for the ports and pins of the RH850/F1K series. The states depend
on the chosen low-power mode and may not have the same behavior for ports and pins.
• Port means that a pin works as a general-purpose input/output pin.
• Pin denotes the physical pin. Every pin is denoted by a unique pin number.
The following overview provides a summary of the port and pin behavior during low-power modes:
Table 12 Behavior during low power mode
State before entering the mode is kept
The ports are not powered and therefore not functional
I/O hold function for isolated area
During the DEEP STOP mode, the state of the port pins on the isolated area can be
held automatically. Thus, its input and/or output remain in the same state as before
entering I/O buffer hold state. No external or internal signal can change its state until
the I/O buffer hold state is terminated.
The I/O buffers in DEEP STOP mode are changing into I/O buffer hold state by
default.
After the wake-up from DEEP STOP mode the I/O buffer hold state is terminated in
the following steps:
o 1. Re-configure the peripheral or port function
o 2. Release I/O hold state by setting IOHOLD.IOHOLD = 0
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