Renesas F-ZTAT H8 Series Hardware Manual page 186

Section 7 Refresh Controller
When a refresh request occurs in the refresh request pending state, the refresh controller acquires
the bus right, then executes a refresh cycle. If another refresh request occurs during execution of
the refresh cycle, it is ignored.
Refresh
request *
Refresh
request *
Note: * A refresh request is ignored if it occurs while the refresh controller is requesting the
bus right or executing a refresh cycle.
Figure 7.3 State Transitions for Refresh Cycle Execution
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Exit from reset or standby mode
Refresh request
Refresh request pending state
Refresh request
Requesting bus right
Bus granted
Executing refresh cycle
End of refresh
cycle
*