DF2398TE20 Renesas Electronics America, DF2398TE20 Datasheet - Page 188
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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6.9
The H8S/2357 Group has a write data buffer function in the external data bus. Using the write data buffer function enables
external writes and DMA single address mode transfers to be executed in parallel with internal accesses. The write data
buffer function is made available by setting the WDBE bit in BCRL to 1.
Figure 6-36 shows an example of the timing when the write data buffer function is used. When this function is used, if an
external write or DMA single address mode transfer continues for 2 states or longer, and there is an internal access next,
only an external write is executed in the first state, but from the next state onward an internal access (on-chip memory or
internal I/O register read/write) is executed in parallel with the external write rather than waiting until it ends.
Rev.6.00 Oct.28.2004 page 158 of 1016
REJ09B0138-0600H
Write Data Buffer Function
External
space
write
Note : n = 0 to 7
Internal address bus
Internal read signal
Figure 6-36 Example of Timing when Write Data Buffer Function is Used
HWR, LWR
D
A
15
23
to D
to A
CSn
0
0
T
1
On-chip memory read Internal I/O register read
T
Internal memory
2
External write cycle
External address
T
W
Internal I/O register address
T
W
T
3
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