R4F24278NVFQU Renesas Electronics America, R4F24278NVFQU Datasheet - Page 455

• 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
(3)
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.
• Write data buffer function and DMAC register setting
• Write data buffer function and next DMAC operation
REJ09B0565-0100 Rev. 1.00
Jul 22, 2010
If the setting of a register that controls external accesses is changed during execution of an
external access by means of the write data buffer function, the external access may not be
performed normally. Registers that control external accesses should only be manipulated when
external reads, etc., are used with DMAC operation disabled, and the operation is not
performed in parallel with external access.
The DMAC can start its next operation during external access using the write data buffer
function. Consequently, the DREQ pin sampling timing, TEND output timing, etc., are
different from the case in which the write data buffer function is disabled. Also, internal bus
cycles maybe hidden, and not visible.
Write Data Buffer Function
Section 8 DMA Controller (DMAC)
Page 425 of 1448