R4F24278NVFQU Renesas Electronics America, R4F24278NVFQU Datasheet - Page 306

• 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 PALL command to the REF command cannot be
satisfied, setting the RCW1 and RCW0 bits of REFCR enables one to three wait states to be
inserted after the T
cycle that is set by the TPC1 and TPC0 bits of DRACCR. Set the optimum
Rp
number of waits according to the synchronous DRAM connected and the operating frequency of
this LSI. Figure 7.67 shows the timing when one wait state is inserted. Since the setting of bits
TPC1 and TPC0 of DRACCR is also valid in refresh cycles, the command interval can be
extended by the RCW1 and RCW0 bits after the precharge cycles.
T
T
T
T
T
T
Rp1
Rp2
Rrw
Rr
Rc1
Rc2
SDRAMφ
Address bus
Precharge-sel
RAS
CAS
WE
CKE
High
PALL
NOP
REF
NOP
Figure 7.67 Auto Refresh Timing
(TPC1 = 0, TPC0 = 1, RCW1 = 0, RCW0 = 1)
Page 276 of 1448
REJ09B0565-0100 Rev. 1.00
Jul 22, 2010