DF2148ATE20 Renesas Electronics America, DF2148ATE20 Datasheet - Page 442

• Manufacturer Part Number: DF2148ATE20
• Description: IC H8S MCU FLASH 128K 100-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2148ATE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: Host Interface, I²C, IrDA, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 74
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: HD64F2148ATE20; HD64F2148ATE20

Section 13 Timer Connection
13.3.4
By using the timer connection FRT, even if there is a part of the IHI signal with twice the
frequency, this can be eliminated. In order for this function to operate properly, the duty cycle of
the IHI signal must be approximately 30% or less, or approximately 70% or above.
The 8-bit OCRDM contents or twice the OCRDM contents can be added automatically to the data
captured in ICRD in the FRT, and compare-matches generated at these points. The interval
between the two compare-matches is called a mask interval. A value equivalent to approximately
1/3 the IHI signal period is written in OCRDM. ICRD is set so that capture is performed on the
rise of the IHI signal.
Since the IHI signal supplied to the IHO signal selection circuit is normally set on the rise of the
IHI signal and reset on the fall, its waveform is the same as that of the original IHI signal. When
2fH modification is selected, IHI signal edge detection is disabled during mask intervals. Capture
is also disabled during these intervals.
Examples of FRT TCR settings are shown in table 13.6, and the 2fH modification timing chart is
shown in figure 13.6.
Rev. 4.00 Sep 27, 2006 page 396 of 1130
REJ09B0327-0400
IHI Signal and 2fH Modification
IVI signal
IHI signal
divided
waveform
Figure 13.5 Timing Chart for Measurement of IVI Signal and
FRC
ICRB
ICRB(1)
IHI Signal Divided Waveform Periods
ICRB(2)
ICRB(3)
ICRB(4)