HD6412350 Hitachi, HD6412350 Datasheet - Page 183

• Manufacturer Part Number: HD6412350
• Description: (HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
• Manufacturer: Hitachi

6.5.7
When DRAM is accessed, RAS precharging time must be secured. With the H8S/2350 Series, one
T
setting the TPC bit in MCR to 1. Set the appropriate number of T
connected and the operating frequency of the H8S/2350 Series. Figure 6-16 shows the timing
when two T
When the TCP bit is set to 1, two T
p
state is always inserted when DRAM space is accessed. This can be changed to two T
Note: n = 2 to 5
Read
Write
Precharge State Control
p
states are inserted.
CAS, LCAS
HWR, LWR
HWR, LWR
CSn (RAS)
(UWE, LWE)
(UWE, LWE)
Figure 6-16 Timing with Two Precharge States (2-WE System)
D
D
A
15
23
15
to D
to D
to A
ø
0
0
0
T
p1
p
states are also used for refresh cycles.
T
p2
row
T
r
p
cycles according to the DRAM
T
column
c1
T
c2
p
states by
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