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H8/3003 Datasheet(PDF) 515 Page - Renesas Technology Corp

Part # H8/3003
Description  microcontroller (MCU)
PDF  715 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3003 Datasheet(HTML) 515 Page - Renesas Technology Corp

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14.4.3 Input Sampling and A/D Conversion Time
The A/D converter has a built-in sample-and-hold circuit. The A/D converter samples the analog
input at a time tD after the ADST bit is set to 1, then starts conversion. Figure 14-5 shows the A/D
conversion timing. Table 14-4 indicates the A/D conversion time.
As indicated in figure 14-5, the A/D conversion time includes tD and the input sampling time. The
length of tD varies depending on the timing of the write access to ADCSR. The total conversion
time therefore varies within the ranges indicated in table 14-4.
In scan mode, the values given in table 14-4 apply to the first conversion. In the second and
subsequent conversions the conversion time is fixed at 256 states when CKS = 0 or 128 states
when CKS = 1.
Figure 14-5 A/D Conversion Timing
ø
Address bus
Write signal
Input sampling
timing
ADF
(1)
(2)
t
D
t
SPL
t
CONV
Legend
(1):
(2):
t :
t
:
t
:
D
SPL
CONV
ADCSR write cycle
ADCSR address
Synchronization delay
Input sampling time
A/D conversion time
497



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