DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 677

• 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: -

This LSI incorporates a clock pulse generator which generates the system clock (φ) and internal
clock. The clock pulse generator consists of an oscillator, duty adjustment circuit, and divider.
Figure 21.1 shows a block diagram of the clock pulse generator.
The internal frequency is changed by software according to the settings of the system clock
control register (SCKCR).
CPG0500A_000020020300
EXTAL
XTAL
[Legend]
SCKCR: System clock control register
Figure 21.1 Block Diagram of Clock Pulse Generator
Oscillator
Section 21 Clock Pulse Generator
adjustment
circuit
Duty
Divider
SCKCR
SCK2 to SCK0
System clock
To
Rev.2.00 May. 28, 2009 Page 637 of 732
pin
To peripheral modules
Internal clock
REJ09B0059-0200