DF2268FA13V Renesas Electronics America, DF2268FA13V Datasheet - Page 602

• Manufacturer Part Number: DF2268FA13V
• Description: IC H8S/2268 MCU FLASH 100QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2200r

Specifications of DF2268FA13V

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 13MHz
• Connectivity: I²C, SCI, SmartCard
• Peripherals: LCD, POR, PWM, WDT
• Number Of I /o: 67
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 10x10b, D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 21 Clock Pulse Generator
21.8.2
When designing the board, place the crystal resonator and its load capacitors as close as possible
to the XTAL and EXTAL pins. Make wires as short as possible. Other signal lines should be
routed away from the oscillator circuit, as shown in figure 21.11. This is to prevent induction from
interfering with correct oscillation.
21.8.3
When a microcomputer runs, internal power supply potential will fluctuate synchronized with the
system clock. In addition, according to the individual characteristics of crystal resonator, there is
a case where the amplitude of the oscillation waveform will not be grown sufficiently immediately
after oscillation stabilization period, thus the oscillation waveform is easily affected by the
fluctuation of the power supply voltage. In this condition, oscillation waveform will be unstable,
resulting in the system clock instability and malfunction of the microcomputer.
If a malfunction occurs, the setting of the standby timer select 2 to 0 (STS2 to STS0) bits in the
standby control register (SBYCR) must be set so as for the standby time to be longer.
For example, if a malfunction occurs when the standby time is set to 8192 states, the operation
should be confirmed by setting the standby time to 16384 states or longer.
In addition, if a malfunction similar to at state transition occurs at reset, the RES pin hold time
must be set longer.
Rev. 5.00 Sep. 01, 2009 Page 550 of 656
REJ09B0071-0500
Note on Board Design
Note on Using a Crystal Resonator
Figure 21.11 Note on Board Design of Oscillator Circuit
Avoid
C2
C1
Signal A Signal B
XTAL, OSC2
EXTAL, OSC1
This LSI