DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 436

• 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: -

13.4
13.4.1
The timer connection and TMRX can be used to decode a PWM signal in which 0 and 1 are
represented by the pulse width. To do this, a signal in which a rising edge is generated at regular
intervals must be selected as the IHI signal.
The timer counter (TCNT) in the TMRX is set to count the internal clock pulses and to be cleared
on the rising edge of the external reset signal (IHI signal). The value to be used as the threshold for
deciding the pulse width is written to TCORB. The PWM decoder contains a delay latch which
uses the IHI signal as data and compare-match signal B (CMB) as a clock, and the state of the IHI
signal (the result of the pulse width decision) at the first compare-match signal B timing after the
TCNT is reset by the rise of the IHI signal is output as the PDC signal. Figure 13.3 shows a block
diagram for the PWM decoding.
The pulse width setting using TICRR and TICRF of the TMRX can be used to determine the pulse
width decision threshold.
Examples of TCR and TCORB settings of the TMRX are shown in tables 13.5 and 13.6, and the
PWM decoding timing chart is shown in figure 13.4.
Rev.2.00 May. 28, 2009 Page 396 of 732
REJ09B0059-0200
Operation
PWM Decoding (PDC Signal Generation)