DF2268FA13V Renesas Electronics America, DF2268FA13V Datasheet - Page 545

• 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: -

The H8S/2268 Group contains a Dual-Tone Multi-Frequency generation circuit to generate DTMF
signals. It is not contained in the H8S/2264 Group.
The DTMF signal consists of two types of sine waveforms and is used to access a switch device.
The function of the DTMF signal is shown in the frequency matrix in figure 18.1. The DTMF
generation circuit produces the frequencies corresponding to the numbers and symbols in the
figure.
18.1
• Generating DTMF frequency sine waveform from the system clock (φ)
• Producing low distortion, stable sine waveforms
• Synthesis or single waveform output selectable
• Module stop mode can be set.
Figure 18.2 shows the block diagram for the DTMF generation circuit.
DTMF000B_000020020700
The system clock (2.0 to 20.4 MHz, with 400-kHz steps) is divided to produce a 400-kHz
clock signal. This clock signal is then supplied to the feedback loop, comprised of a variant
program divider and sine waveform counter to generate a DTMF frequency sine waveform.
Sine waveforms signals are output from the high-precision resistor rudder-type D/A converter.
In addition, one cycle is divided into 32, resulting in low-distortion stable signal waveforms.
Synthesized row and column output, row output, or column output are selectable.
Features
Section 18 DTMF Generation Circuit
Figure 18.1 DTMF Frequencies
1
4
7
*
2
5
8
0
3
6
9
#
A
B
C
D
Rev. 5.00 Sep. 01, 2009 Page 493 of 656
R1 (697 Hz)
R2 (770 Hz)
R3 (852 Hz)
R4 (941 Hz)
Section 18 DTMF Generation Circuit
REJ09B0071-0500