R4F24278NVFQU Renesas Electronics America, R4F24278NVFQU Datasheet - Page 307

• 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 7 Bus Controller (BSC)
When the interval specification from the REF command to the ACTV cannot be satisfied, setting
the RLW1 and RLW0 bits of REFCR enables one to three wait states to be inserted in the refresh
cycle. Set the optimum number of waits according to the synchronous DRAM connected and the
operating frequency of this LSI. Figure 7.68 shows the timing when one wait state is inserted.
T
T
T
T
T
Rp
Rr
Rr1
Rcw
Rc2
SDRAMφ
Address bus
Precharge-sel
RAS
CAS
WE
CKE
High
NOP
PALL
REF
Figure 7.68 Auto Refresh Timing
(TPC1 = 0, TPC0 = 0, RLW1 = 0, RLW0 = 1)
REJ09B0565-0100 Rev. 1.00
Page 277 of 1448
Jul 22, 2010