HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 594

• Manufacturer Part Number: HD6417144
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

15. A/D Converter
15.4.3
In single-cycle scan mode , A/D conversion is to be performed once on the specified channels.
Operations are as follows.
1. When the ADST bit in ADCR is set to 1 by a software, MTU, or external trigger input, A/D
2. When A/D conversion for each channel is completed, the result is sequentially transferred to
3. When conversion of all the selected channels is completed, the ADF bit in ADCSR is set to 1.
4. After A/D conversion ends, the ADST bit is automatically cleared to 0 and the A/D converter
15.4.4
The A/D converter has a built-in sample-and-hold circuit for each module. The A/D converter
samples the analog input when the A/D conversion start delay time (t
bit in ADCR is set to 1, then starts conversion. Figure 15.2 shows the A/D conversion timing.
Table 15.3 shows the A/D conversion time.
As indicated in figure 15.2, the A/D conversion time (t
(t
conversion time therefore varies within the ranges indicated in table 15.3.
In scan mode, the values given in table 15.3 apply to the first conversion time. The values given in
table 15.4 apply to the second and subsequent conversions.
Rev.4.00 Mar. 27, 2008 Page 550 of 882
REJ09B0108-0400
SPL
conversion starts on the channel with the lowest number in the group (AN0, AN1, ..., AN3).
the A/D data register corresponding to each channel.
If the ADIE bit is set to 1 at this time, an ADI interrupt is requested after A/D conversion ends.
enters the idle state. When the ADST bit is cleared to 0 during A/D conversion, A/D
conversion stops and the A/D converter enters the idle state.
). The length of t
Single-Cycle Scan Mode
Input Signal Sampling and A/D Conversion Time
D
varies depending on the timing of the write access to ADCR. The total
CONV
) includes t
D
D
) has passed after the ADST
and the input sampling time