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SH7041A Datasheet(PDF) 618 Page - Renesas Technology Corp

No. de pieza SH7041A
Descripción Electrónicos  Renesas 32-Bit Single-Chip RISC Microprocessor SuperH RISC engine Family/SH7040 Series(CPU Core SH-2)
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Fabricante Electrónico  RENESAS [Renesas Technology Corp]
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SH7041A Datasheet(HTML) 618 Page - Renesas Technology Corp

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16.4.3
Input Sampling and A/D Conversion Time
The mid-speed A/D converter is equipped with a sample and hold circuit. The mid-speed A/D
converter samples input after t
D hours has elapsed since setting the ADST bit of the A/D
control/status register (ADCSR) to 1, then begins conversion. The A/D conversion timing is
shown in table 16.4.
The A/D conversion time, as shown in figure 16.5, includes both t
D and input sampling time. Here,
t
D is determined by the write timing to ADCSR and is not constant. Thus the conversion time
changes in the range shown in table 16.4.
The conversion time shown in table 16.4 is the time for the first conversion. For the second
conversion and after, the time will be 256 state (fixed) for CKS=0 and 128 state (fixed) for
CKS=1.
(1)
(2)
CK
ADF
t D
t SPL
t CONV
< Key>
(1): Write cycle of ADCSR
(2): Address of ADCSR
Address
Write signal
Input sampling
timing
tD: A/D conversion start delay time
tSPL: Input sampling time
tCONV: A/D conversion time
Figure 16.5 A/D Conversion Timing



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