DF2148ATE20 Renesas Electronics America, DF2148ATE20 Datasheet - Page 674

• 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 20 A/D Converter
20.4.3
The A/D converter has a built-in sample-and-hold circuit. The A/D converter samples the analog
input at a time t
conversion timing. Table 20.4 indicates the A/D conversion time.
As indicated in figure 20.5, the A/D conversion time includes t
length of t
time therefore varies within the ranges indicated in table 20.4.
In scan mode, the values given in table 20.4 apply to the first conversion time. In the second and
subsequent conversions the conversion time is fixed at 256 states when CKS = 0 or 128 states
when CKS = 1.
Rev. 4.00 Sep 27, 2006 page 628 of 1130
REJ09B0327-0400
Input Sampling and A/D Conversion Time
D
varies depending on the timing of the write access to ADCSR. The total conversion
D
φ
Address
Write signal
Input sampling
timing
ADF
Legend:
(1)
(2)
t
t
t
after the ADST bit is set to 1, then starts conversion. Figure 20.5 shows the A/D
D
SPL
CONV
: ADCSR write cycle
: ADCSR address
: A/D conversion start delay time
: Input sampling time
: A/D conversion time
Figure 20.5 A/D Conversion Timing
(1)
(2)
t
D
t
SPL
t
CONV
D
and the input sampling time. The