HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 745

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

16.4.3
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 16.4 indicates the A/D conversion time.
As indicated in figure 16.5, the A/D conversion time includes t
length of t
time therefore varies within the ranges indicated in table 16.4.
In scan mode, the values given in table 16.4 apply to the first conversion time. In the second and
subsequent conversions the conversion time is as shown in table 16.5.
Input Sampling and A/D Conversion Time
D
φ
Address bus
Write signal
Input sampling
timing
ADF
varies depending on the timing of the write access to ADCSR. The total conversion
Legend:
(1):
(2):
t
t
t
D
SPL
CONV
:
D
after the ADST bit is set to 1, then starts conversion. Figure 16.5 shows the A/D
:
: A/D conversion time
ADCSR write cycle
ADCSR address
A/D conversion start delay
Input sampling time
(1)
(2)
Figure 16.5 A/D Conversion Timing
t
D
Section 16 A/D Converter (8 Analog Input Channel Version)
t
SPL
t
CONV
Rev.6.00 Sep. 27, 2007 Page 715 of 1268
D
and the input sampling time. The
REJ09B0220-0600