Renesas H8SX/1653 - Manual (Page 33)

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Section 6 Restrictions
There are the following restrictions on emulation of the H8SX/1653 group when the user system
interface board is connected to the emulator.
1. The USB clock frequency is fixed to 48 MHz regardless of the EXTAL input.
2. P14 cannot be used as a port if the serial output function has already been selected. The port
pin state cannot be read from the port register.