DF2148ATE20 Renesas Electronics America, DF2148ATE20 Datasheet - Page 780

• Manufacturer Part Number: DF2148ATE20
• Description: IC H8S MCU FLASH 128K 100-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2148ATE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: Host Interface, I²C, IrDA, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 74
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: HD64F2148ATE20; HD64F2148ATE20

Section 24 Clock Pulse Generator
24.3
Clock pulses can be supplied by connecting a crystal resonator, or by input of an external clock.
24.3.1
Circuit Configuration
A crystal resonator can be connected as shown in the example in figure 24.2. Select the damping
resistance R
Table 24.2 Damping Resistance Value
Frequency (MHz)
R
Crystal resonator
Figure 24.3 shows the equivalent circuit of the crystal resonator. Use a crystal resonator that has
the characteristics shown in table 24.3 and the same frequency as the system clock ( ).
Rev. 4.00 Sep 27, 2006 page 734 of 1130
REJ09B0327-0400
d
( )
Oscillator
Connecting a Crystal Resonator
d
according to table 24.2. An AT-cut parallel-resonance crystal should be used.
Figure 24.2 Connection of Crystal Resonator (Example)
XTAL
EXTAL
XTAL
2
1k
Figure 24.3 Crystal Resonator Equivalent Circuit
4
500
R
d
L
C
C
C
C
8
200
L
0
L1
L2
AT-cut parallel-resonance type
R
s
10
0
C
L1
= C
EXTAL
12
0
L2
= 10 to 22 pF
16
0
20
0