HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 554

• Manufacturer Part Number: HD6417706
• Description: Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

19.6.4
The A/D converter has a built-in sample-and-hold circuit. The A/D converter samples the analog
input at a time t
shows the A/D conversion timing. Table 19.3 indicates the A/D conversion time.
As indicated in figure 19.8, the A/D conversion time includes t
length of t
time therefore varies within the ranges indicated in table 19.3.
In multi mode and scan mode, the values given in table 19.3 apply to the first conversion. In the
second and subsequent conversions the conversion time is fixed at 512 states when CKS = 0 or
256 states when CKS = 1.
Rev. 4.00, 03/04, page 508 of 660
Input Sampling and A/D Conversion Time
D
varies depending on the timing of the write access to ADCSR. The total conversion
t
t
t
Notes: 1. ADCSR write cycle
D
SPL
CONV
D
Input sampling
after the ADST bit in ADCSR is set to 1, then starts conversion. Figure 19.8
: A/D conversion start delay
: Input sampling time
: A/D conversion time
2. ADCSR address
Address
signal
timing
Write
ADF
P
Figure 19.8 A/D Conversion Timing
*
*
1
2
t
D
t
SPL
t
CONV
D
and the input sampling time. The