DF2148BTE20 Renesas Electronics America, DF2148BTE20 Datasheet - Page 638

• Manufacturer Part Number: DF2148BTE20
• Description: IC H8S MCU FLASH 128K 100-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2148BTE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, IrDA, SCI, X-Bus
• Peripherals: 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): 4.5 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: HD64F2148BTE20; HD64F2148BTE20

Section 20 D/A Converter
Table 20.2 D/A Channel Enable
Bit 7
DAOE1
0
1
20.4
The D/A converter incorporates two channels of the D/A circuits and can be converted
individually.
When the DAOE bit in DACR is set to 1, D/A conversion is enabled and conversion results are
output.
An example of D/A conversion of channel 0 is shown below. The operation timing is shown in
figure 20.2.
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 DAOE0 bit is cleared to 0, analog output is disabled.
Rev. 3.00 Mar 21, 2006 page 582 of 788
REJ09B0300-0300
conversion results are output from the analog output pin DA0. The conversion results are
output continuously until DADR0 is modified or the DAOE0 bit is cleared to 0. The output
value is calculated by the following formula:
conversion results are output.
DADR contents/256
Operation
Bit 6
DAOE0
0
1
0
1
Bit 5
DAE
—
0
1
0
1
—
AVref
Description
Disables D/A conversion
Enables D/A conversion for channel 0
Disables D/A conversion for channel 1
Enables D/A conversion for channels 0 and 1
Disables D/A conversion for channel 0
Enables D/A conversion for channel 1
Enables D/A conversion for channels 0 and 1
Enables D/A conversion for channels 0 and 1
DCONV
,
DCONV
,