DF2345TE20 Renesas Electronics America, DF2345TE20 Datasheet - Page 644

• Manufacturer Part Number: DF2345TE20
• Description: MCU 5V 128K 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2345TE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SCI, SmartCard
• Peripherals: POR, PWM, WDT
• Number Of I /o: 71
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4.5 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: HD64F2345TE20; HD64F2345TE20

Section 18 Clock Pulse Generator
Crystal Resonator: Figure 18.3 shows the equivalent circuit of the crystal resonator. Use a crystal
resonator that has the characteristics shown in table 18.3 and the same resonance frequency as the
system clock ( ).
Table 18.3 Crystal Resonator Parameters
Frequency (MHz)
R
C
Note on Board Design: When a crystal resonator is connected, the following points should be
noted:
Other signal lines should be routed away from the oscillator circuit to prevent induction from
interfering with correct oscillation. See figure 18.4.
When designing the board, place the crystal resonator and its load capacitors as close as possible
to the XTAL and EXTAL pins.
Rev. 4.00 Feb 15, 2006 page 618 of 900
REJ09B0291-0400
S
0
max (pF)
max ( )
XTAL
Figure 18.3 Crystal Resonator Equivalent Circuit
2
500
7
Figure 18.4 Example of Incorrect Board Design
Avoid
C
C
4
120
7
L2
L1
L
Signal A Signal B
C
C
8
80
7
L
0
AT-cut parallel-resonance type
R
s
60
7
10
XTAL
EXTAL
H8S/2345
EXTAL
60
7
12
16
50
7
20
40
7