CHAPTER 4: Resets
170 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
1. Capturing reset factors
Reset factors are captured and retained until a reset is issued to the device.
2. Issuing resets
When a reset is ready to be issued, a device internal reset is issued.
3. Clearing resets
When a reset factor is cleared, a device internal reset is extended for the amount of time required
to clear the reset (for example, a wait time required until oscillation of a high-speed CR has
become stable). When the extended period of time has expired, the reset is cleared.
4. Determining operation mode
The operation mode defined by MD0 and MD1 is determined as PONR, LVDH or INITX is cleared
and notified to each piece of the hardware. Any other reset factors do not cause the operation
mode to change.
5. Reset vector fetch
After a device internal reset is cleared, the CPU starts fetching a reset vector. The CPU fetches
the obtained reset vector into the program counter and starts programmed operations.
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