DF2357F20 Renesas Electronics America, DF2357F20 Datasheet - Page 694

• Manufacturer Part Number: DF2357F20
• Description: IC H8S MCU FLASH 5V 128K 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2357F20

• 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: 128KB (128K 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: 128-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Note on Board Design: When a crystal resonator is connected, the following points should be noted.
Other signal lines should be routed away from the oscillator circuit to prevent induction from interfering with correct
oscillation. See figure 20-4.
When designing the board, place the crystal resonator and its load capacitors as close as possible to the XTAL and
EXTAL pins.
20.3.2
Circuit Configuration: An external clock signal can be input as shown in the examples in figure 20-5. If the XTAL pin is
left open, make sure that stray capacitance is no more than 10 pF.
In example (b) in fugure 20-5, make sure that the external clock is held high in standby mode.
External Clock: The external clock signal should have the same frequency as the system clock (ø).
Rev.6.00 Oct.28.2004 page 664 of 1016
REJ09B0138-0600H
External Clock Input
EXTAL
EXTAL
XTAL
XTAL
Figure 20-4 Example of Incorrect Board Design
Avoid
Figure 20-5 External Clock Input (Examples)
(b) Complementary clock input at XTAL pin
C
C
L2
L1
Signal A Signal B
(a) XTAL pin left open
Open
H8S/2357 Group
XTAL
EXTAL
External clock input
External clock input