h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 521

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

15.4.3
The A/D converter includes the sample-and-hold circuit. The A/D converter samples the analog
input when the A/D conversion start delay time (t
then conversion is started. Figure 15.2 shows the A/D conversion timing. Table 15.3 shows the
A/D conversion time.
As shown in figure 15.2, the A/D conversion time (t
The length of t
conversion time varies within the range shown in table 15.3.
In scan mode, the values given in table 15.3 indicate the first conversion time. The second and
subsequent conversion time is shown in table 15.4. In both cases, set bits CKS1 and CKS0 in
ADCR within the range shown in table 23.7 in section 23, Electrical Characteristics.
Input Sampling and A/D Conversion Time
D
varies depending on the timing of the write access to ADCSR. Therefore, the total
Address
Write signal
Input sampling
timing
ADF
φ
[Legend]
(1):
(2):
t
t
t
D
SPL
CONV
:
:
: A/D conversion time
A/D conversion start delay
Input sampling time
ADCSR write cycle
ADCSR address
Figure 15.2 A/D Conversion Timing
(1)
(2)
t
D
t
SPL
D
) has passed after the ADST bit is set to 1, and
CONV
t
CONV
) includes t
Rev. 2.00 Dec. 05, 2005 Page 483 of 724
D
and input sampling time (t
Section 15 A/D Converter
REJ09B0200-0200
SPL
).