HD6433682 ETC, HD6433682 Datasheet - Page 354

• Manufacturer Part Number: HD6433682
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series
• Manufacturer: ETC

18.4.3
The A/D converter has a built-in sample-and-hold circuit. The A/D converter samples the analog
input when the A/D conversion start delay time (t
starts conversion. Figure 18.2 shows the A/D conversion timing. Table 18.3 shows the A/D
conversion time.
As indicated in figure 18.2, the A/D conversion time includes t
length of t
time therefore varies within the ranges indicated in table 18.3.
In scan mode, the values given in table 18.3 apply to the first conversion time. In the second and
subsequent conversions, the conversion time is 128 states (fixed) when CKS = 0 and 66 states
(fixed) when CKS = 1.
Rev. 3.00, 05/03, page 324 of 472
Input Sampling and A/D Conversion Time
D
varies depending on the timing of the write access to ADCSR. The total conversion
Address
Write signal
Input sampling
timing
ADF
ø
Legend
(1) :
(2) :
t
t
t
D
SPL
CONV
:
:
:
A/D conversion start delay time
Input sampling time
A/D conversion time
ADCSR write cycle
ADCSR address
Figure 18.2 A/D Conversion Timing
(1)
(2)
t
D
t
SPL
D
) has passed after the ADST bit is set to 1, then
t
CONV
D
and the input sampling time. The