HD64F3048F16 Datasheet, PDF (178/903 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 6 Bus Controller
Example of Wait State Control Settings
A reset initializes ASTCR and WCER to H'FF and WCR to H'F3, selecting programmable wait
mode and three wait states for all areas. Software can select other wait modes for individual areas
by modifying the ASTCR, WCER, and WCR settings. Figure 6.16 shows an example of wait
mode settings.
Area 0
Area 1
Area 2
3-state-access area,
programmable wait mode
(3 states inserted)
3-state-access area,
programmable wait mode
(3 states inserted)
3-state-access area,
pin wait mode 0
Area 3
3-state-access area,
pin wait mode 0
Area 4
2-state-access area,
no wait states inserted
Area 5
2-state-access area,
no wait states inserted
Area 6
2-state-access area,
no wait states inserted
Area 7
2-state-access area,
no wait states inserted
Bit: 7 6 5 4 3 2 1 0
ASTCR H'0F: 0 0 0 0 1 1 1 1
WCER H'33: 0 0 1 1 0 0 1 1
WCR H'F3:     0 0 1 1
Note: Wait states cannot be inserted in areas designated for two-state access by ASTCR.
Figure 6.16 Wait Mode Settings (Example)
Rev. 3.00 Sep 27, 2006 page 150 of 872
REJ09B0325-0300