DF2398TE20 Renesas Electronics America, DF2398TE20 Datasheet - Page 708

• Manufacturer Part Number: DF2398TE20
• Description: IC H8S MCU FLASH 256K 120TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2398TE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 87
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K 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: 120-TQFP, 120-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: HD64F2398TE20; HD64F2398TE20

21.7
21.7.1
When the STBY pin is driven low, a transition is made to hardware standby mode from any mode.
In hardware standby mode, all functions enter the reset state and stop operation, resulting in a significant reduction in
power dissipation. As long as the prescribed voltage is supplied, on-chip RAM data is retained. I/O ports are set to the
high-impedance state.
In order to retain on-chip RAM data, the RAME bit in SYSCR should be cleared to 0 before driving the STBY pin low.
Do not change the state of the mode pins (MD
Hardware standby mode is cleared by means of the STBY pin and the RES pin. When the STBY pin is driven high while
the RES pin is low, the reset state is set and clock oscillation is started. Ensure that the RES pin is held low until the clock
oscillator stabilizes (at least 8 ms—the oscillation stabilization time—when using a crystal oscillator). When the RES pin
is subsequently driven high, a transition is made to the program execution state via the reset exception handling state.
21.7.2
Figure 21-3 shows an example of hardware standby mode timing.
When the STBY pin is driven low after the RES pin has been driven low, a transition is made to hardware standby mode.
Hardware standby mode is cleared by driving the STBY pin high, waiting for the oscillation stabilization time, then
changing the RES pin from low to high.
Rev.6.00 Oct.28.2004 page 678 of 1016
REJ09B0138-0600H
Hardware Standby Mode
Hardware Standby Mode
Hardware Standby Mode Timing
Oscillator
RES
STBY
Figure 21-3 Hardware Standby Mode Timing (Example)
2
to MD
0
) while the H8S/2357 Group is in hardware standby mode.
Oscillation
stabilization
time
exception
handling
Reset