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H8/3021 Datasheet(PDF) 457 Page - Renesas Technology Corp

Part # H8/3021
Description  16-Bit Single-Chip Microcomputer
PDF  712 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3021 Datasheet(HTML) 457 Page - Renesas Technology Corp

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13. A/D Converter
Rev.2.00 Mar. 22, 2007 Page 433 of 684
REJ09B0352-0200
13.4.3
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 t
D after the ADST bit is set to 1, then starts conversion. Figure 13.5 shows the A/D
conversion timing. Table 13.4 indicates the A/D conversion time.
As indicated in figure 13.5, the A/D conversion time includes t
D and the input sampling time. The
length of t
D varies depending on the timing of the write access to ADCSR. The total conversion
time therefore varies within the ranges indicated in table 13.4.
In scan mode, the values given in table 13.4 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.
(1)
(2)
φ
Address bus
Write signal
Input sampling
timing
ADF
tD
tSPL
tCONV
Legend
(1):
(2):
tD:
tSPL:
tCONV:
ADCSR write cycle
ADCSR address
Synchronization delay
Input sampling time
A/D conversion time
Figure 13.5 A/D Conversion Timing



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