h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 746

• Manufacturer Part Number: h8s-2635
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 17 A/D Converter
17.4.3
Input Sampling and A/D Conversion Time
The A/D converter has an on-chip sample-and-hold circuit. The A/D converter samples the analog
input at a time t
after the ADST bit is set to 1, then starts conversion. Figure 17-5 shows the A/D
D
conversion timing. Table 17-4 indicates the A/D conversion time.
As indicated in figure 17-5, the A/D conversion time includes t
and the input sampling time. The
D
length of t
varies depending on the timing of the write access to ADCSR. The total conversion
D
time therefore varies within the ranges indicated in table 17-4.
In scan mode, the values given in table 17-4 apply to the first conversion time. The values given in
table 17-5 apply to the second and subsequent conversions. In both cases, set bits CKS1 and CKS0
in ADCR to give a conversion time of at least 10 µs.
φ
Figure 17-5 A/D Conversion Timing
Rev. 6.00 Feb 22, 2005 page 686 of 1484
REJ09B0103-0600