HD64F3039F18 Datasheet, PDF (152/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

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 6.9 shows an example of wait mode
settings.
Area 0
Area 1
3-state-access area,
programmable wait mode
3-state-access area,
programmable wait mode
Area 2
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 6.9 Wait Mode Settings (Example)
Rev.3.00 Mar. 26, 2007 Page 128 of 682
REJ09B0353-0300