R4F24278NVFQU Renesas Electronics America, R4F24278NVFQU Datasheet - Page 278

• 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

Section 7 Bus Controller (BSC)
Depending on the DRAM used, modification of the WE signal may not be permitted during the
refresh period. In this case, the CBRM bit in REFCR should be set to 1. The bus controller will
then insert refresh cycles in appropriate breaks between bus cycles. Figure 7.50 shows an example
of the timing when the CBRM bit is set to 1. In this case the CS signal is not controlled, and
retains its value prior to the start of the refresh period.
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φ
A23 to A0
CS
AS
RD
HWR (WE)
RAS
CAS
Figure 7.50 Example of CBR Refresh Timing (CBRM = 1)
Normal space access request
Refresh period
H8S/2427, H8S/2427R, H8S/2425 Group
REJ09B0565-0100 Rev. 1.00
Jul 22, 2010