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IMPORTANT
Note on NMI* Input:
• NMI* input from the target system is accepted only while a user program is being executed (only
while the RUN status LED on the PC7501's upper panel is lit).
Notes on Interruption:
•Even when the user program is not being executed (when the user program is paused or when run-
time debugging is being performed), the evaluation MCU is operating for debugging purposes.
Therefore, take note that timers and other functions are not stopped when the user program is not
being executed.
• Even if a maskable interrupt is generated when the user program is not being executed (when the
user program is paused or when run-time debugging is being performed), the interrupt cannot be
accepted, because the emulator disables interrupts. If an interrupt is requested when a user program
is not being executed and the user program allow an interrupt, the interrupt is accepted immediately
after the user program execution is started.
• When the user program is not being executed (when the user program is paused or when run-time
debugging is being performed), a peripheral I/O interruption is not accepted. Take note that when
the user program is not being executed, a request a peripheral I/O interruption can be cleared.
Note on Clock Supply to the MCU:
• Clock can be supplied to the evaluation MCU in one of the following two ways. This is determined
by emulator debugger clock selection.
(1) When Internal is selected:
The clock generated by the oscillation circuit in the PC7501 is supplied to the evaluation
MCU. The clock is continually supplied to the evaluation MCU regardless of "target system
clock status" and "user program execution status".
(2) When External is selected:
Clock supply to the evaluation MCU depends on oscillation status (oscillate/off) of the target
system.
Notes on Access Prohibited Area:
• The emulator control register (000020h - 00003Fh) in the SFR is read and write-protected. When
this register is accessed, emulator control cannot be utilized.
•With this product, address FFFFFFh cannot be read or written in correctly.
Notes on Stack Area:
• With this product, a maximum 20 bytes of the user stack is consumed as work area.
• If the user stack does not have enough area, do not use areas which cannot be used as stack (SFR
area, RAM area which stores data, or ROM area) as work area. Using areas like this is a cause of
user program crashes and destabilized emulator control. Therefore, ensure the +20 byte maximum
capacity used by the user program as the user stack area.
•With this product, the interrupt stack pointer (ISP) is set to 0500h and used as stack area after the
reset is released.