HD6432646 Hitachi, HD6432646 Datasheet - Page 636
HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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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. The values given
in table 16-5 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.
602
Input Sampling and A/D Conversion Time
D
ø
Input sampling
timing
ADF
varies depending on the timing of the write access to ADCSR. The total conversion
Address
Write signal
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
: ADCSR write cycle
: ADCSR address
: A/D conversion start delay
: Input sampling time
: A/D conversion time
(1)
(2)
Figure 16-5 A/D Conversion Timing
t
D
t
SPL
t
CONV
D
and the input sampling time. The
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