DF3048BVX25V Renesas Electronics America, DF3048BVX25V Datasheet - Page 204

• 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
Self-Refresh Mode
Some DRAM devices have a self-refresh function. After the SRFMD bit is set to 1 in RFSHCR,
when a transition to software standby mode occurs, the CAS and RAS outputs go low in that order
so that the DRAM self-refresh function can be used. On exit from software standby mode, the
CAS and RAS outputs both go high.
Table 7.7 shows the pin states in software standby mode. Figure 7.6 shows the signal output
timing.
Table 7.7
Signal
HWR
LWR
RD
CS
RFSH
Rev. 3.00 Sep 27, 2006 page 176 of 872
REJ09B0325-0300
3
Pin States in Software Standby Mode (1) (PSRAME = 0, DRAME = 1)
CAS/WE
High-impedance
High-impedance
High-impedance
High
High
WE = 0
WE
WE
SRFMD = 0
CAS/WE
High-impedance
High-impedance
High-impedance
High
High
WE = 1
WE
WE
Software Standby Mode
CAS/WE
High
High
Low
Low
Low
SRFMD = 1 (self-refresh mode)
WE = 0
WE
WE
CAS/WE
Low
Low
High
Low
Low
WE = 1
WE
WE