R4F24278NVFQU Renesas Electronics America, R4F24278NVFQU Datasheet - Page 448

• Manufacturer Part Number: R4F24278NVFQU
• Description: MCU 512K/48K 2.7-5.5V 144-LQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2400r

Specifications of R4F24278NVFQU

• Core Processor: H8S/2600
• Core Size: 16/32-Bit
• Speed: 33MHz
• Connectivity: EBI/EMI, I²C, IrDA, SCI, Smart Card, SPI, SSU, UART/USART
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 98
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Eeprom Size: -
• Ram Size: 64K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x10b; D/A 2x8b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 144-LQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

H8S/2427, H8S/2427R, H8S/2425 Group
Section 8 DMA Controller (DMAC)
1
8.5.13
Relation between DMAC and External Bus Requests, Refresh Cycles*
,
2
and EXDMAC*
1
2
When the DMAC accesses external space, contention with a refresh cycle*
, EXDMAC cycle*
, or
external bus release cycle may arise. In this case, the bus controller will suspend the transfer and
1
2
insert a refresh cycle*
, EXDMAC cycle*
, or external bus release cycle, in accordance with the
external bus priority order, even if the DMAC is executing a burst transfer or block transfer. (An
external access by the DTC or CPU, which has a lower priority than the DMAC, is not executed
until the DMAC releases the external bus.)
When the DMAC transfer mode is dual address mode, the DMAC releases the external bus after
an external write cycle. The external read cycle and external write cycle are inseparable, and so the
bus cannot be released between these two cycles.
When the DMAC accesses internal space (on-chip memory or an internal I/O register), the DMAC
1
2
cycle may be executed at the same time as a refresh cycle*
, EXDMAC cycle*
, or external bus
release cycle.
Notes: 1. Not supported in the 5-V version.
2. Not supported by the H8S/2425 Group.
Page 418 of 1448
REJ09B0565-0100 Rev. 1.00
Jul 22, 2010