NEC µPD72257 Preliminary User's Manual page 329

External Memory Interface Controller
Bit Bit name Function
... ...
0C
13 clocks (MEMSMTMGR2 default)
H
... ...
3F
64 clocks
H
Caution:
Set TRC[5:0] one clock higher than required by the connected memory.
Preliminary User's Manual S19203EE1V3UM00
Chapter 9
329