DF2398TE20 Renesas Electronics America, DF2398TE20 Datasheet - Page 176

• Manufacturer Part Number: DF2398TE20
• Description: IC H8S MCU FLASH 256K 120TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2398TE20

• 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: 120-TQFP, 120-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: HD64F2398TE20; HD64F2398TE20

Rev.6.00 Oct.28.2004 page 146 of 1016
REJ09B0138-0600H
RAS up mode
To select RAS up mode, clear the RCDM bit in MCR to 0. Each time access to DRAM space is interrupted and
another space is accessed, the RAS signal goes high again. Burst operation is only performed if DRAM space is
continuous. Figure 6-22 shows an example of the timing in RAS up mode.
In the case of burst ROM space access, the RAS signal is not restored to the high level.
CAS, LCAS
Note: n = 2 to 5
CSn, (RAS)
D
A
15
23
to D
to A
ø
0
0
Figure 6-22 Example of Operation Timing in RAS Up Mode
T
p
DRAM access
T
r
T
c1
T
c2
DRAM access
T
c1
T
c2
External space
T
1
access
T
2