r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 187

• Manufacturer Part Number: r4f2426
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

6.3.4
RDNCR selects the read strobe signal (RD) negation timing in a basic bus interface read access.
Bit
7
6
5
4
3
2
1
0
Bit Name
RDN7
RDN6
RDN5
RDN4
RDN3
RDN2
RDN1
RDN0
Read Strobe Timing Control Register (RDNCR)
Initial Value
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Read Strobe Timing Control 7 to 0
These bits set the negation timing of the read
strobe in a corresponding area read access.
As shown in figure 6.2, the read strobe for an area
for which the RDNn bit is set to 1 is negated one
half-state earlier than that for an area for which the
RDNn bit is cleared to 0. The read data setup and
hold time specifications are also one half-state
earlier.
0: In an area n read access, the RD is negated at
1: In an area n read access, the RD is negated
the end of the read cycle
one half-state before the end of the read cycle
Rev. 1.00 Sep. 19, 2008 Page 159 of 1270
Section 6 Bus Controller (BSC)
REJ09B0466-0100
(n = 7 to 0)