DF3048BVX25V Renesas Electronics America, DF3048BVX25V Datasheet - Page 216

• Manufacturer Part Number: DF3048BVX25V
• Description: MCU 3/5V 128K PB-FREE 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of DF3048BVX25V

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 7 Refresh Controller
Operation in Power-Down State
The refresh controller operates in sleep mode. It does not operate in hardware standby mode. In
software standby mode RTCNT is initialized, but RFSHCR, RTMCSR bits 5 to 3, and RTCOR
retain their settings prior to the transition to software standby mode.
Example
Pseudo-static RAM may have separate OE and RFSH pins, or these may be combined into a single
OE/RFSH pin. Figure 7.17 shows an example of a circuit for generating an OE/RFSH signal.
Check the device characteristics carefully, and design a circuit that fits them. Figure 7.18 shows a
setup procedure to be followed by a program.
Rev. 3.00 Sep 27, 2006 page 188 of 872
REJ09B0325-0300
Figure 7.17 Interconnection to Pseudo-Static RAM with OE
H8/3048B Group
RFSH
RD
OE/RFSH
OE
OE
OE/RFSH
RFSH Signal (Example)
RFSH
RFSH
PSRAM