DF3048X16V Renesas Electronics America, DF3048X16V Datasheet - Page 699

• Manufacturer Part Number: DF3048X16V
• Description: MCU 5V 128K,PB-FREE 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of DF3048X16V

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 16MHz
• 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): 4.5 V ~ 5.5 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: -

21.5
21.5.1
Regardless of its current state, the chip enters hardware standby mode whenever the STBY pin
goes low. Hardware standby mode reduces power consumption drastically by halting all functions
of the CPU, DMAC, refresh controller, and on-chip supporting modules. All modules are reset
except the on-chip RAM. As long as the specified voltage is supplied, on-chip RAM data is
retained. I/O ports are placed in the high-impedance state.
Clear the RAME bit to 0 in SYSCR before STBY goes low to retain on-chip RAM data.
The inputs at the mode pins (MD2 to MD0) should not be changed during hardware standby
mode.
21.5.2
Hardware standby mode is exited by inputs at the STBY and RES pins. While RES is low, when
STBY goes high, the clock oscillator starts running. RES should be held low long enough for the
clock oscillator to settle. When RES goes high, reset exception handling begins, followed by a
transition to the program execution state.
21.5.3
Figure 21.2 shows the timing relationships for hardware standby mode. To enter hardware standby
mode, first drive RES low, then drive STBY low. To exit hardware standby mode, first drive
STBY high, wait for the clock to settle, then bring RES from low to high.
Hardware Standby Mode
Transition to Hardware Standby Mode
Exit from Hardware Standby Mode
Timing for Hardware Standby Mode
Rev. 7.00 Sep 21, 2005 page 673 of 878
Section 21 Power-Down State
REJ09B0259-0700