HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 169

• Manufacturer Part Number: HD6417034B
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

For CPU write cycles and DMAC dual mode write cycles to external memory space, the number
of states and wait state insertion cannot be controlled by WCR1. In areas 1, 3, 4, 5, and 7, the
WAIT signal is sampled and the number of states is 2 plus the number of wait states set by the
WAIT signal (figure 8.13). In areas 0, 2 and 6, the number of states is 1 state plus the number of
long wait states plus the number of wait states set by the WAIT signal (figure 8.14). Do not write
0 in bits 7–2 and 0 of WCR1; only write 1. When area 1 is being used as external memory space,
do not write 0 in bit 1 (WW1); always write 1.
Figure 8.14 Wait State Timing for External Memory Space Access (1 State Plus Long Wait
Write
Read
WRH, WRL
State (When Set to Insert 3 States) Plus Wait States from WAIT
AD15–AD0
AD15–AD0
A21–A0
WAIT
CSn
RD
CK
T1
T
LW1
set in WCR3
Wait states
T
LW2
Rev. 7.00 Jan 31, 2006 page 143 of 658
Section 8 Bus State Controller (BSC)
signal input
from WAIT
Wait state
T
W
WAIT
WAIT
WAIT Signal)
states set
in WCR3
Wait
T
REJ09B0272-0700
LW3