DF71251AD50FPV Renesas Electronics America, DF71251AD50FPV Datasheet - Page 88

• 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: -

4.6
Clock pulses can be supplied from a connected crystal resonator or an external clock.
4.6.1
A crystal resonator can be connected as shown in figure 4.2. Use the damping resistance (Rd)
listed in table 4.6. Use a crystal resonator that has a resonance frequency of 10 to 12.5 MHz. It is
recommended to consult the crystal resonator manufacturer concerning the compatibility of the
crystal resonator and the LSI.
Table 4.6
Figure 4.3 shows an equivalent circuit of the crystal resonator. Use a crystal resonator with the
characteristics listed in table 4.7.
Rev. 5.00 Mar. 06, 2009 Page 68 of 770
REJ09B0243-0500
Frequency (MHz)
Rd (Ω) (Reference Values)
Oscillator
Connecting Crystal Resonator
Damping Resistance Values (Reference Values)
EXTAL
XTAL
Figure 4.2 Connection of Crystal Resonator (Example)
Figure 4.3 Crystal Resonator Equivalent Circuit
R
d
XTAL
0
10
C
C
L1
L2
L
C
C
C
L1
L
0
= C
L2
R s
= 18 to 22 pF (Reference values)
EXTAL
12.5
0