HD64F2338VFC25 Renesas Electronics America, HD64F2338VFC25 Datasheet - Page 306
HD64F2338VFC25
Manufacturer Part Number
HD64F2338VFC25
Description
MCU 3V 256K 144-QFP
Manufacturer
Renesas Electronics America
Series
H8® H8S/2300r
Datasheet
1.DF2338VFC25V.pdf
(1246 pages)
Specifications of HD64F2338VFC25
Core Processor
H8S/2000
Core Size
16-Bit
Speed
25MHz
Connectivity
SCI, SmartCard
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
106
Program Memory Size
256KB (256K x 8)
Program Memory Type
FLASH
Ram Size
8K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Data Converters
A/D 12x10b; D/A 4x8b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
144-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:
HD64F2338VFC25
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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Figure 7.26 shows an example of DREQ level activated block transfer mode transfer.
DREQ pin sampling is performed every cycle, with the rising edge of the next φ cycle after the
end of the DMABCR write cycle for setting the transfer enabled state as the starting point.
When the DREQ pin low level is sampled while acceptance by means of the DREQ pin is
possible, the request is held in the DMAC. Then, when activation is initiated in the DMAC, the
request is cleared. After the end of the dead cycle, acceptance resumes, DREQ pin low level
sampling is performed again, and this operation is repeated until the transfer ends.
Rev.4.00 Sep. 07, 2007 Page 274 of 1210
REJ09B0245-0400
[1]
[2] [5] The request is cleared at the next bus break, and activation is started in the DMAC.
[3] [6] The DMA cycle is started.
[4] [7] Acceptance is resumed after the dead cycle is completed.
Note: In write data buffer mode, bus breaks from [2] to [7] may be hidden, and not visible.
φ
DREQ
Address
bus
DMA
control
Channel
Acceptance after transfer enabling; the DREQ pin low level is sampled on the rising edge of φ,
and the request is held.
(As in [1], the DREQ pin low level is sampled on the rising edge of φ, and the request is held.)
Figure 7.26 Example of DREQ Level Activated Block Transfer Mode Transfer
Idle
Bus release
[1]
Request
of 2 cycles
Minimum
[2]
Read
[3]
Transfer source
Request clear period
DMA
read
Write
1 block transfer
Transfer destination
DMA
write
Acceptance resumes
Dead
[4]
Request
DMA
dead
of 2 cycles
Minimum
Idle
[5]
release
Bus
Read
[6]
Transfer source
Request clear period
DMA
read
Write
1 block transfer
Transfer destination
DMA
write
Dead
Acceptance resumes
DMA
dead
[7]
Idle
release
Bus
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