Format Of Memory Expansion Wait Setting Register (Mm) - NEC 78K0 User Manual

(2) Memory expansion wait setting register (MM)
MM sets the number of waits.
MM is set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets MM to 10H.
Figure 5-4. Format of Memory Expansion Wait Setting Register (MM)
Address: FFF8H After reset: 10H
Symbol 7
MM 0
PW1
0
0
1
1
Cautions 1. To control wait with external wait pin, be sure to set WAIT/P66 pin to input mode
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CHAPTER 5 EXTERNAL BUS INTERFACE
R/W
6 5
0 PW1
PW0
0 No wait
1 Wait (one wait state inserted)
0 Setting prohibited
1 Wait control by external wait pin
(set bit 6 (PM66) of port mode register 6 (PM6) to 1).
2. If the external wait pin is not used for wait control, the WAIT/P66 pin can be used
as an I/O port pin.
User's Manual U15947EJ2V0UD
4 3 2
PW0 0 0
Wait control
*
1 0
0 0