DF2268FA13V Renesas Electronics America, DF2268FA13V Datasheet - Page 598

• 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
21.2.3
When two or more external clocks (e.g.: 10 MHz and 2 MHz) are used as the system clock, input
clock should be switched in software standby mode.
An example of external clock switching circuit is shown in figure 21.6. An example of external
clock switching timing is shown in figure 21.7.
Rev. 5.00 Sep. 01, 2009 Page 546 of 656
REJ09B0071-0500
Notes on Switching External Clock
Figure 21.6 External Clock Switching Circuit (Examples)
EXTAL
External clock 1
External clock 2
Figure 21.5 External Clock Input Timing
Control
circuit
t
EXr
External clock switch request
External interrupt signal
External clock switch signal
t
EXH
t
EXf
t
EXL
This LSI
Port output
External
interrupt
EXTAL
V
CC
× 0.5