DF71251AD50FPV Renesas Electronics America, DF71251AD50FPV Datasheet - Page 89

• Manufacturer Part Number: DF71251AD50FPV
• Description: MCU RISC FLASH 32K 8K 64LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH Tinyr

Specifications of DF71251AD50FPV

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 37
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Table 4.7
4.6.2
Figure 4.4 shows an example of an external clock input connection. In this case, make the external
clock high level to stop it when in software standby mode. During operation, make the external
input clock frequency 10 to 12.5 MHz.
When leaving the XTAL pin open, make sure the parasitic capacitance is less than 10 pF.
Even when inputting an external clock, be sure to wait at least the oscillation stabilization time in
power-on sequence or in releasing software standby mode, in order to ensure the PLL stabilization
time.
Frequency (MHz)
Rs Max. (Ω) (Reference Values)
C
0
Max. (pF) (Reference Values) 7
External Clock Input Method
Crystal Resonator Characteristics
EXTAL
Figure 4.4 Example of External Clock Connection
XTAL
10
60
Open state
External clock input
Rev. 5.00 Mar. 06, 2009 Page 69 of 770
12.5
50
7
REJ09B0243-0500