DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 464
DF2437FV
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
-
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DF2437FV
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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14.4
14.4.1
Figure 14.2 shows an example of duty measurement for the external event signal.
1. Select the external event signal whose duty needs to be measured by the IS2 to IS0 bits in
2. Select the count clock source for TWCNT by the CK2 to CK0 bits in TWCR1.
3. Write 1 to the START bit in TWCR2. At this time, TWCNT is cleared to H'00.
4. When a rising edge of the external event signal is detected, TWCNT starts counting. Then, if a
When TWICR and TWCNT values are read and then compared, duty measurement for the
external event signal is accomplished.
Rev.2.00 May. 28, 2009 Page 424 of 732
REJ09B0059-0200
falling edge of the external event signal is detected, the TWCNT value is transferred to
TWICR. If the second rising edge of the external event signal is detected, TWCNT stops
counting. At this time, the ENDF flag in TWCR2 is set to 1.
TWCR1.
Operation
Duty Measurement for External Event Signal
External event signal
Figure 14.2 Example of Duty Measurement for External Event Signal
Duty measurement
START signal
TWCNT
end flag
TWICR
H'00
M
N
TWCNT
clear
X
N
Count stop
t
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