R4F24278NVFQU Renesas Electronics America, R4F24278NVFQU Datasheet - Page 332

• 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)
(7)
Note: The DRAM interface is not supported by the 5-V version.
(a)
While the DRMI bit is cleared to 0 in DRACCR, idle cycle insertion after DRAM space access is
disabled. Idle cycle insertion after DRAM space access can be enabled by setting the DRMI bit to
1. The conditions and number of states of the idle cycle to be inserted are in accordance with the
settings of bits ICIS1, ICIS0, and IDLC in BCR are valid. Figures 7.88 and 7.89 show examples of
idle cycle operation when the DRMI bit is set to 1.
When the DRMI bit is cleared to 0, an idle cycle is not inserted after DRAM space access even if
bits ICIS1 and ICIS0 are set to 1.
Page 302 of 1448
Idle Cycle in Case of Normal Space Access after DRAM Space Access
Normal space access after DRAM space read access
UCAS, LCAS
Address bus
Data bus
(Consecutive Reads in Different Areas) (IDLC = 0, RAST = 0, CAST = 0)
RAS
Figure 7.88 Example of Idle Cycle Operation after DRAM Access
RD
φ
T
p
DRAM space read
T
r
T
c1
T
c2
Idle cycle
T
i
External space read
T
1
T
2
T
H8S/2427, H8S/2427R, H8S/2425 Group
3
DRAM space read
T
i
REJ09B0565-0100 Rev. 1.00
T
c1
T
c2
Jul 22, 2010