D12674RVFQ33D Renesas Electronics America, D12674RVFQ33D Datasheet - Page 376

• Manufacturer Part Number: D12674RVFQ33D
• Description: MCU 3V 0K I-TEMP 144-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2600r

Specifications of D12674RVFQ33D

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 33MHz
• Connectivity: IrDA, SCI
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 103
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 12x10b; D/A 4x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 144-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Other names: HD6412674RVFQ33D; HD6412674RVFQ33D

Section 7 DMA Controller (DMAC)
request is cleared. After the end of the single cycle, acceptance resumes, DREQ pin low level
sampling is performed again, and this operation is repeated until the transfer ends.
7.5.11
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 BCR 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 from the TEND pin 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 7.32 shows an example of burst mode transfer from on-chip RAM to external memory
using the write data buffer function.
Figure 7.33 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. 3.00 Mar 17, 2006 page 324 of 926
REJ09B0283-0300
Figure 7.32 Example of Dual Address Transfer Using Write Data Buffer Function
Internal read signal
External address
Internal address
Write Data Buffer Function
HWR, LWR
TEND
DMA
read
DMA
write
DMA
read
DMA
write
DMA
read
DMA
write
DMA
read
DMA
write
DMA
dead