DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 680

• Manufacturer Part Number: DF2437FV
• Description: IC H8S/2437 MCU FLASH 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2400r

Specifications of DF2437FV

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 85
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

21.2
Clock pulses can be supplied either by connecting a crystal resonator or by providing external
clock input.
21.2.1
Figure 21.2 shows a typical method of connecting a crystal resonator. An appropriate damping
resistance R
should be used.
Figure 21.3 shows the equivalent circuit of a crystal resonator. A crystal resonator having the
characteristics given in table 21.2 should be used.
Table 21.1 Damping Resistor Values
Frequency (MHz)
R
Rev.2.00 May. 28, 2009 Page 640 of 732
REJ09B0059-0200
d
(Ω)
Oscillator
Connecting Crystal Resonator
d
, given in table 21.1, should be used. An AT-cut parallel-resonance crystal resonator
XTAL
Figure 21.2 Typical Connection to Crystal Resonator
Figure 21.3 Equivalent Circuit of Crystal Resonator
10
0
EXTAL
XTAL
L
R
d
12
0
C
C
L
0
C
C
AT-cut parallel-resonance crystal resonator
L1
L2
R
s
16
0
EXTAL
C
L1
= C
20
0
L2
= 10 to 22 pF