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CHAPTER 2 CPU
2.9
Reset Sequence
This section explains CPU resetting.
Causes of Resetting
The causes of resetting are as follows:
•
Input from an external reset pin
•
Software reset by manipulation of the SRST bit of standby control register (STCR)
•
Expiration of watchdog timer
•
Power-on reset
Initialization by Resetting
When a cause for resetting occurs, the CPU is initialized.
Releasing from the external reset pin or software reset
•
The pin is set to the predetermined state.
•
Each resource in the device is put in the reset state. The control register is initialized to the
predetermined value.
•
The lowest gear is selected for the clock frequency.
Reset Sequence
After the cause of resetting is cleared, the CPU executes the following reset sequence:
•
(000FFFFC
<Note>
After the CPU is reset, the operation mode is defined in details using the mode register.
For details, see the description of the mode register in Section 2.10, "Operation Mode."
68
) --> PC
H
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