DF3048BVX25V Renesas Electronics America, DF3048BVX25V Datasheet - Page 215

• 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: -

Self-Refresh Mode
Some pseudo-static RAM 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 H8/3048B Group’s CS
goes high and its RFSH output goes low so that the pseudo-static RAM self-refresh function can
be used. On exit from software standby mode, the RFSH output goes high.
Table 7.8 shows the pin states in software standby mode. Figure 7.16 shows the signal output
timing.
Table 7.8
Signal
CS
RD
HWR
LWR
RFSH
3
Address
bus
CS
RD
HWR
LWR
RFSH
Figure 7.16 Signal Output Timing in Self-Refresh Mode (PSRAME = 1, DRAME = 0)
3
Pin States in Software Standby Mode (2) (PSRAME = 1, DRAME = 0)
High
SRFMD = 0
High
High-impedance
High-impedance
High-impedance
High
Software standby mode
High-impedance
High-impedance
High-impedance
High-impedance
Software Standby Mode
SRFMD = 1 (Self-Refresh Mode)
High
High-impedance
High-impedance
High-impedance
Low
Rev. 3.00 Sep 27, 2006 page 187 of 872
Oscillator
settling time
Section 7 Refresh Controller
REJ09B0325-0300
3
output