R4F24278NVFQU Renesas Electronics America, R4F24278NVFQU Datasheet - Page 266

• 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)
7.7.9
There are two ways of inserting wait states in a DRAM access cycle: program wait insertion and
pin wait insertion using the WAIT pin.
Wait states are inserted to extend the CAS assertion period in a read access to DRAM space, and
to extend the write data setup time relative to the falling edge of CAS in a write access.
(1)
When the bit in ASTCR corresponding to an area designated as DRAM space is set to 1, from 0 to
7 wait states can be inserted automatically between the T
settings in WTCR.
(2)
When the WAITE bit in BCR is set to 1 and the ASTCR bit is set to 1, wait input by means of the
WAIT pin is enabled. When DRAM space is accessed in this state, a program wait (T
inserted. If the WAIT pin is low at the rising edge of φ in the last T
inserted. If the WAIT pin is held low, T
Figures 7.38 and 7.39 show examples of wait cycle insertion timing in the case of 2-state and 3-
state column address output cycles.
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Program Wait Insertion
Pin Wait Insertion
Wait Control
w
states are inserted until it goes high.
c1
state and T
H8S/2427, H8S/2427R, H8S/2425 Group
c1
or T
c2
state, according to the
w
state, another T
REJ09B0565-0100 Rev. 1.00
w
) is first
Jul 22, 2010
w
state is