DF2398TE20 Renesas Electronics America, DF2398TE20 Datasheet - Page 177
DF2398TE20
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
HD64F2398TE20
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DF2398TE20V
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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6.5.11
The H8S/2357 Group is provided with a DRAM refresh control function. Either of two refreshing methods can be
selected: CAS-before-RAS (CBR) refreshing, or self-refreshing.
CAS-before-RAS (CBR) Refreshing: To select CBR refreshing, set the RFSHE bit in DRAMCR to 1, and clear the
RMODE bit to 0.
With CBR refreshing, RTCNT counts up using the input clock selected by bits CKS2 to CKS0 in DRAMCR, and when
the count matches the value set in RTCOR (compare match), refresh control is performed. At the same time, RTCNT is
reset and starts counting again from H'00. Refreshing is thus repeated at fixed intervals determined by RTCOR and bits
CKS2 to CKS0. Set a value in RTCOR and bits CKS2 to CKS0 that will meet the refreshing interval specification for the
DRAM used.
When bits CKS2 to CKS0 are set, RTCNT starts counting up. RTCNT and RTCOR settings should therefore be
completed before setting bits CKS2 to CKS0.
Do not clear the CMF flag when refresh control is being performed (RFSHE = 1).
RTCNT operation is shown in figure 6-23, compare match timing in figure 6-24, and CBR refresh timings in figure 6-25.
Refresh Control
Refresh request
Refresh request signal
and CMF bit setting signal
RTCOR
H'00
RTCNT
RTCOR
ø
RTCNT
Figure 6-24 Compare Match Timing
Figure 6-23 RTCNT Operation
N
N
Rev.6.00 Oct.28.2004 page 147 of 1016
H'00
REJ09B0138-0600H
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