r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 252

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

Section 9 Bus State Controller (BSC)
9.5.4
The number of cycles from CSn assertion to RD, WRL assertion can be specified by setting bits
SW1 and SW0 in CSnWCR. The number of cycles from RD, WRL negation to CSn negation can
be specified by setting bits HW1 and HW0. Therefore, a flexible interface to an external device
can be obtained. Figure 9.8 shows an example. A Th cycle and a Tf cycle are added before and
after an ordinary cycle, respectively. In these cycles, RD and WRL are not asserted, while other
signals are asserted. The data output is prolonged to the Tf cycle, and this prolongation is useful
for devices with slow writing operations.
Rev. 1.00 Sep. 21, 2007 Page 226 of 1124
REJ09B0402-0100
CSn Assert Period Extension
Read
Write
A19 to A0
D7 to D0
D7 to D0
WRL
CSn
RD
CK
Figure 9.8 CSn Assert Period Extension
Th
T1
T2
Tf