DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 608

• 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: -

(a) Flash Program/Erase Frequency Parameter (FPEFEQ: General Register ER0 of CPU)
FPEFEQ sets the operating frequency of the CPU. The settable range of the operating frequency in
this LSI is 5 to 20 MHz.
(b) Flash Pass/Fail Parameter (FPFR: General Register R0L of CPU)
FPFR indicates the return value of the initialization result.
Rev.2.00 May. 28, 2009 Page 568 of 732
REJ09B0059-0200
Bit
31 to 16 ⎯
15 to 0 F15 to F0 ⎯
Bit Name
Initial
Value
⎯
R/W
⎯
R/W
Description
Unused
These bits should be cleared to 0.
Frequency Set
Set the operating frequency of the CPU. With the PLL
multiplication function, set the frequency multiplied. The
setting value must be calculated as the following
methods.
•
•
For example, when the operating frequency of the CPU
is 20.000 MHz, the value is as follows.
•
•
The operating frequency which is shown in MHz units
must be rounded a number to three decimal places
and be shown in a number of two decimal places.
The value multiplied by 100 is converted to the binary
digit and is written to FPEFEQ (general register
ER0).
The number to three decimal places of 20.000 is
rounded and the value is thus 20.00.
The formula that 20.00 × 100 = 2000 is converted to
the binary digit and B'0000, B'0111, B'1101, and
B'0000 (H'07D0) are set to ER0.