DF2238RTF6 Renesas Electronics America, DF2238RTF6 Datasheet - Page 772

• Manufacturer Part Number: DF2238RTF6
• Description: MCU 2.2/3V 256K 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2200r

Specifications of DF2238RTF6

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 6MHz
• Connectivity: I²C, SCI, SmartCard
• Peripherals: POR, PWM, WDT
• Number Of I /o: 72
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 2.2 V ~ 3.6 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: HD64F2238RTF6; HD64F2238RTF6

Section 18 D/A Converter
18.4
Two channels of the D/A converter can perform conversion individually.
When the DAOE bit in DACR is set to 1, D/A conversion is enabled and the conversion results are
output.
An example of D/A conversion of channel 0 is shown below. The operation timing is shown in
figure 18.2.
1. Write conversion data to DADR0.
2. When the DAOE0 bit in DACR is set to 1, D/A conversion starts. After the interval of t
3. Conversion starts immediately after DADR0 is modified. After the interval of t
4. When the DAOE bit is cleared to 0, analog output is disabled.
Rev. 6.00 Mar. 18, 2010 Page 710 of 982
REJ09B0054-0600
the conversion results are output from the analog output pin DA0. The conversion results are
output continuously until DADR0 is modified or DAOE0 bit is cleared to 0. The output value
is calculated by the following formula:
(DADR contents) / 256 × Vref
conversion results are output.
Legend:
t
DCONV
φ
Address
DADR0
DAOE0
DA0
Operation
: D/A conversion time
DADR0
write cycle
High impedance state
Figure 18.2 D/A Converter Operation Example
DACR
write cycle
Conversion data (1)
t
DCONV
Conversion result (1)
DADR0
write cycle
t
DCONV
Conversion data (2)
Conversion result (2)
DACR
write cycle
DCONV
,
DCONV
,