DF2268FA13V Renesas Electronics America, DF2268FA13V Datasheet - Page 549

• Manufacturer Part Number: DF2268FA13V
• Description: IC H8S/2268 MCU FLASH 100QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2200r

Specifications of DF2268FA13V

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 13MHz
• Connectivity: I²C, SCI, SmartCard
• Peripherals: LCD, POR, PWM, WDT
• Number Of I /o: 67
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 10x10b, D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

18.4
18.4.1
The DTMF generation circuit provides synthesized row and column groups output waveforms or
sine waveforms (DTCR signal) of row or column group from TONED pin. These signals are
produced in the high-precision resistor rudder-type D/A converter. The output frequency is set in
DTCR.
Figure 18.3 shows the TONED pin output equivalent circuit. Figure 18.4 shows a single output
waveform of column or row group alone. One cycle of the output waveform is divided into 32,
resulting in low-distortion stable signal waveforms.
Table 18.2 shows DTMF generation circuit output signal and typical signal frequencies, and
frequency deviation between the two.
Figure 18.4 TONED Pin Output Waveform (Row or Column Group Alone)
Operation
Output Waveform
Output control
AV
AV
CC
SS
1 2 3 4 5 6 7 8 9 10111213141516171819202122232425
Figure 18.3 TONED Pin Output Equivalent Circuit
control
Time slot
Row
Column
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Section 18 DTMF Generation Circuit
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AV
AV
TONED
CC
SS