DF2505FC26V Renesas Electronics America, DF2505FC26V Datasheet - Page 831

• Manufacturer Part Number: DF2505FC26V
• Description: IC H8S/2505 MCU FLASH 144QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2500r

Specifications of DF2505FC26V

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 26MHz
• Connectivity: I²C, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 104
• Program Memory Size: 384KB (384K x 8)
• Program Memory Type: FLASH
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 16x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 144-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

21.2.3
When two or more external clocks (e.g.: 10 MHz and 20 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.
Notes on Switching External Clock
Figure 21.6 External Clock Switching Circuit (Examples)
External clock 1
External clock 2
Control
circuit
External clock switch request
External interrupt signal
External clock switch signal
Rev. 6.00 Sep. 24, 2009 Page 783 of 928
This LSI
Port output
External
interrupt
EXTAL
Section 21 Clock Pulse Generator
REJ09B0099-0600