HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 201

• Manufacturer Part Number: HD6412332
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

6.5.7
When DRAM is accessed, RAS precharging time must be secured. With the chip, one T
always inserted when DRAM space is accessed. This can be changed to two T
the TPC bit in MCR to 1. Set the appropriate number of T
connected and the operating frequency of the chip. Figure 6.16 shows the timing when two T
states are inserted.
When the TCP bit is set to 1, two T
Read
Write
Note: n = 2 to 5
Precharge State Control
A
CS
CAS, LCAS
HWR (WE)
D
HWR (WE)
D
φ
23
15
15
n
to A
to D
to D
(RAS)
0
0
0
Figure 6.16 Timing with Two-State Precharge Cycle
T
p1
p
states are also used for refresh cycles.
T
p2
Rev.4.00 Sep. 07, 2007 Page 171 of 1210
p
Row
T
cycles according to the DRAM
r
T
c1
Column
p
states by setting
REJ09B0245-0400
T
c2
p
state is
p