DF2398F20V Renesas Electronics America, DF2398F20V Datasheet - Page 175
DF2398F20V
Manufacturer Part Number
DF2398F20V
Description
IC H8S/2300 MCU FLASH 128QFP
Manufacturer
Renesas Electronics America
Series
H8® H8S/2300r
Specifications of DF2398F20V
Core Processor
H8S/2000
Core Size
16-Bit
Speed
20MHz
Connectivity
SCI, SmartCard
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
87
Program Memory Size
256KB (256K x 8)
Program Memory Type
FLASH
Ram Size
8K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b; D/A 2x8b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
128-QFP
For Use With
YR0K42378FC000BA - KIT EVAL FOR H8S/2378
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
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Manufacturer
Quantity
Price
Company:
Part Number:
DF2398F20V
Manufacturer:
Renesas Electronics America
Quantity:
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DF2398F20V
Manufacturer:
Renesas Electronics America
Quantity:
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RAS Down Mode and RAS Up Mode: Even when burst operation is selected, it may happen that access to DRAM space
is not continuous, but is interrupted by access to another space. In this case, if the RAS signal is held low during the
access to the other space, burst operation can be resumed when the same row address in DRAM space is accessed again.
RAS down mode
To select RAS down mode, set the RCDM bit in MCR to 1. If access to DRAM space is interrupted and another space
is accessed, the RAS signal is held low during the access to the other space, and burst access is performed if the row
address of the next DRAM space access is the same as the row address of the previous DRAM space access. Figure 6-
21 shows an example of the timing in RAS down mode.
Note, however, that the RAS signal will go high if a refresh operation interrupts RAS down mode.
CAS, LCAS
CSn, (RAS)
D
Note: n = 2 to 5
A
15
23
to D
to A
ø
0
0
Figure 6-21 Example of Operation Timing in RAS Down Mode
T
p
DRAM access
T
r
T
c1
T
c2
External space
T
1
access
T
2
Rev.6.00 Oct.28.2004 page 145 of 1016
DRAM access
T
c1
T
c2
REJ09B0138-0600H
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