R4F24278NVFQU Renesas Electronics America, R4F24278NVFQU Datasheet - Page 274

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R4F24278NVFQU

Manufacturer Part Number
R4F24278NVFQU
Description
MCU 512K/48K 2.7-5.5V 144-LQFP
Manufacturer
Renesas Electronics America
Series
H8® H8S/2400r
Datasheet

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

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Part Number
Manufacturer
Quantity
Price
Part Number:
R4F24278NVFQU
Manufacturer:
REALTEK
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Part Number:
R4F24278NVFQU
Manufacturer:
Renesas Electronics America
Quantity:
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Section 7 Bus Controller (BSC)
• RAS Up Mode
Page 244 of 1448
φ
Address bus
RASn (CSn)
UCAS, LCAS
RD
OE
Data bus
Note: n = 2 to 5
To select RAS up mode, clear the RCDM bit to 0 in DRAMCR. Each time access to DRAM
space is interrupted and another space is accessed, the RAS signal goes high again. Burst
operation is only performed if DRAM space is continuous. Figure 7.45 shows an example of
the timing in RAS up mode.
Figure 7.45 Example of Operation Timing in RAS Up Mode
T
Row address
p
DRAM space read
T
r
(RAST = 0, CAST = 0)
Column address 1 Column address 2
T
c1
T
c2
T
DRAM space
c1
read
H8S/2427, H8S/2427R, H8S/2425 Group
T
c2
REJ09B0565-0100 Rev. 1.00
External address
Normal space
T
1
read
T
2
Jul 22, 2010

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