HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 266
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HD6412373R
Manufacturer Part Number
HD6412373R
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412373R.pdf
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Section 6 Bus Controller (BSC)
6.6.8
When DRAM is accessed, a RAS precharge time must be secured. With this LSI, one T
always inserted when DRAM space is accessed. From one to four T
setting bits TPC1 and TPC0 in DRACCR. Set the optimum number of T
DRAM connected and the operating frequency of this LSI. Figure 6.25 shows the timing when
two T
cycles.
Rev.7.00 Mar. 18, 2009 page 198 of 1136
REJ09B0109-0700
Read
Write
Note: n = 2 to 5
p
states are inserted. The setting of bits TPC1 and TPC0 is also valid for T
Precharge State Control
φ
Address bus
RASn (CSn)
UCAS, LCAS
WE (HWR)
OE (RD)
Data bus
WE (HWR)
OE (RD)
Data bus
Figure 6.25 Example of Timing with Two-State Precharge Cycle
T
p1
(RAST = 0, CAST = 0)
Row address
T
p2
High
High
T
r
p
states can be selected by
T
c1
Column address
p
cycles according to the
p
states in refresh
T
c2
p
state is
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