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Section 6 Restrictions
There are the following restrictions on emulation of the H8SX/1663 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.
3. The user system interface board does not support subclock operation. Thus the following
function and register cannot be used:
- 32k timer
- Subclock control register (SUBCKCR) of the clock pulse generator
- Interrupt priority register D (IPRD2 to IPRD0)
4. Exception processing of sleep instructions is not supported. Even if the SLPIE bit of the
standby control register (SBYCR) is set to 1, the emulator enters the power-down mode and no
exception processing of sleep instructions occurs.