DF2328BVF25V Renesas Electronics America, DF2328BVF25V Datasheet - Page 319

• Manufacturer Part Number: DF2328BVF25V
• Description: IC H8S MCU FLASH 256K 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2328BVF25V

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 25MHz
• 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): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• For Use With: EDK2329 - DEV EVALUATION KIT H8S/2329
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Other names: HD64F2328BVF25V

DREQ Pin Falling Edge Activation Timing: Set the DTA bit for the channel for which the
DREQ pin is selected to 1.
Figure 7.23 shows an example of DREQ pin falling edge activated normal 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, and DREQ pin high level sampling for edge detection is started. If DREQ pin
high level sampling has been completed by the time the DMA write cycle ends, acceptance
resumes after the end of the write cycle, DREQ pin low level sampling is performed again, and
this operation is repeated until the transfer ends.
[1]
[2] [5] The request is cleared at the next bus break, and activation is started in the DMAC.
[3] [6] Start of DMA cycle; DREQ pin high level sampling on the rising edge of φ starts.
Note: In write data buffer mode, bus breaks from [2] to [7] may be hidden, and not visible.
[4] [7] When the DREQ pin high level has been sampled, acceptance is resumed after the write cycle
φ
DREQ
Address
bus
DMA
control
Channel
Figure 7.23 Example of DREQ Pin Falling Edge Activated Normal Mode Transfer
Acceptance after transfer enabling; the DREQ pin low level is sampled on the rising edge of φ,
and the request is held.
is completed.
(As in [1], the DREQ pin low level is sampled on the rising edge of φ, and the request is held.)
Idle
[1]
Request
Bus release
of 2 cycles
Minimum
[2]
Read
[3]
Transfer source
Request clear period
DMA
read
Write
Section 7 DMA Controller (Not Supported in the H8S/2321)
Transfer destination
Acceptance resumes
DMA
write
Idle
[4]
Request
of 2 cycles
Minimum
release
Rev.6.00 Sep. 27, 2007 Page 287 of 1268
Bus
[5]
Read
[6]
Transfer source
Request clear period
DMA
read
Write
Transfer destination
Acceptance resumes
REJ09B0220-0600
DMA
write
Idle
[7]
release
Bus