FUJITSU MB91460 SERIES FR60 - Manual (Page 557)

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Chapter 31 External Bus
2.External Bus Interface Registers
Table 4.2-47 lists the settings for the refresh cycle (tRC).
Table 2-31 Settings for the refresh cycle (tRC)
TRC2 TRC1 TRC0 Refresh cycle (tRC)
0 0 0 4
0 0 1 5
0 1 0 6
0 1 1 7
1 0 0 8
1 0 1 9
1 1 0 10
1 1 1 11