R4F24268NVFQV Renesas Electronics America, R4F24268NVFQV Datasheet - Page 302

• Manufacturer Part Number: R4F24268NVFQV
• Description: MCU 256K FLASH 48K 144-LQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2400r

Specifications of R4F24268NVFQV

• Core Processor: H8S/2600
• Core Size: 16/32-Bit
• Speed: 33MHz
• Connectivity: EBI/EMI, I²C, IrDA, SCI, SSU, UART/USART
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 96
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 10x10b, 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
• Eeprom Size: -

H8S/2426, H8S/2426R, H8S/2424 Group
Section 6 Bus Controller (BSC)
T
T
T
T
T
Rp
Rr
Rr1
Rcw
Rc2
φ
SDRAMφ
Address bus
Precharge-sel
RAS
CAS
WE
CKE
High
NOP
PALL
REF
Figure 6.68 Auto Refresh Timing
(TPC = 0, TPC0 = 0, RLW1 = 0, RLW0 = 1)
Self-Refreshing
(2)
A self-refresh mode (battery backup mode) is provided for synchronous DRAM as a kind of
standby mode. In this mode, refresh timing and refresh addresses are generated within the
synchronous DRAM.
To select self-refreshing, set the RFSHE bit to 1 in REFCR. When a SLEEP instruction is
executed to enter software standby mode, the SELF command is issued, as shown in figure 6.69.
When software standby mode is exited, the SLFRF bit in REFCR is cleared to 0 and self-refresh
mode is exited automatically. If an auto refresh request occurs when making a transition to
software standby mode, auto refreshing is executed, and then self-refresh mode is entered.
When using self-refresh mode, the OPE bit must not be cleared to 0 in SBYCR.
Page 272 of 1372
REJ09B0466-0350 Rev. 3.50
Jul 09, 2010