SH7211 Datasheet, PDF (260/1228 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family

Section 8 Bus State Controller (BSC)
8.5.3 Access Wait Control
Wait cycle insertion on a normal space access can be controlled by the settings of bits WR3 to
WR0 in CSnWCR. It is possible for areas 1, 4, 5, and 7 to insert wait cycles independently in read
access and in write access. Areas 0, 2, 3, and 6 have common access wait for read cycle and write
cycle. The specified number of Tw cycles are inserted as wait cycles in a normal space access
shown in figure 8.7.
T1
Tw
T2
CK
A25 to A0
CSn
Read
RD/WR
RD
D15 to D0
Write
WEn
D15 to D0
BS
DACKn*
Note: * The waveform for DACKn is when active low is specified.
Figure 8.7 Wait Timing for Normal Space Access (Software Wait Only)
Rev. 2.00 May. 08, 2008 Page 236 of 1200
REJ09B0344-0200