DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 457

• 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 has an on-chip duty measurement circuit which consists of an edge detection circuit,
8-bit counter, and capture register. This circuit can measure the duty by detecting edges of an
external event signal and capturing the high-level period and cycle.
Figure 14.1 shows a block diagram of the duty measurement circuit.
14.1
• Selection of a counter operating signal from eight operating clocks
• Automatic duty measurement of eight external event signals for two systems
• Two interrupt sources
TIM8FR1A_010020020700
One of the eight operating clocks (φ, φ/2, φ/4, φ/8, φ/32, φ/2048, φ/32768, or φ/65536) can be
selected.
Using an edge detection circuit enables both edges of the external event signal to be detected
and capturing the counter value enables the duty to be measured. One of eight external event
signals (2-system HSYNC, 2-system CSYNC, 2-system VSYNC, HFBACK, or VFBACK)
can be selected.
There are two interrupt sources: Duty measurement end and overflow.
Features
Section 14 Duty Measurement Circuit
Rev.2.00 May. 28, 2009 Page 417 of 732
REJ09B0059-0200