DF2357F20 Renesas Electronics America, DF2357F20 Datasheet - Page 260
DF2357F20
Manufacturer Part Number
DF2357F20
Description
IC H8S MCU FLASH 5V 128K 128QFP
Manufacturer
Renesas Electronics America
Series
H8® H8S/2300r
Datasheet
1.D12392F20V.pdf
(1049 pages)
Specifications of DF2357F20
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
128KB (128K 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
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DF2357F20
Manufacturer:
Renesas Electronics America
Quantity:
10 000
Company:
Part Number:
DF2357F20IV
Manufacturer:
Renesas Electronics America
Quantity:
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7.5.12
DMAC internal-to-external dual address transfers and single address transfers can be executed at high speed using the
write data buffer function, enabling system throughput to be improved.
When the WDBE bit of BCRL in the bus controller is set to 1, enabling the write data buffer function, dual address
transfer external write cycles or single address transfers and internal accesses (on-chip memory or internal I/O registers)
are executed in parallel. Internal accesses are independent of the bus master, and DMAC dead cycles are regarded as
internal accesses.
A low level can always be output from the TEND pin if the bus cycle in which a low level is to be output is an external
bus cycle. However, a low level is not output from the TEND pin if the bus cycle in which a low level is to be output
from the TEND pin is an internal bus cycle, and an external write cycle is executed in parallel with this cycle.
Figure 7-33 shows an example of burst mode transfer from on-chip RAM to external memory using the write data buffer
function.
Figure 7-34 shows an example of single address transfer using the write data buffer function. In this example, the CPU
program area is in on-chip memory.
Rev.6.00 Oct.28.2004 page 230 of 1016
REJ09B0138-0600H
Write Data Buffer Function
Figure 7-33 Example of Dual Address Transfer Using Write Data Buffer Function
Internal read signal
External address
Internal address
HWR, LWR
TEND
ø
DMA
read
DMA
write
DMA
read
DMA
write
DMA
read
DMA
write
DMA
read
DMA
write
DMA
dead
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