H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 689

• Manufacturer Part Number: H8S-2350
• Description: 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

15.4.3
The A/D converter has a built-in sample-and-hold circuit. The A/D converter samples the analog
input at a time t
conversion timing. Table 15.4 indicates the A/D conversion time.
As indicated in figure 15.5, the A/D conversion time includes t
length of t
time therefore varies within the ranges indicated in table 15.4.
In scan mode, the values given in table 15.4 apply to the first conversion time. In the second and
subsequent conversions the conversion time is fixed at 256 states when CKS = 0 or 128 states
when CKS = 1.
Input Sampling and A/D Conversion Time
D
Address bus
Write signal
Input sampling
timing
ADF
Legend:
(1)
(2)
t
t
t
D
SPL
CONV
varies depending on the timing of the write access to ADCSR. The total conversion
D
after the ADST bit is set to 1, then starts conversion. Figure 15.5 shows the A/D
: ADCSR write cycle
: ADCSR address
: A/D conversion start delay
: Input sampling time
: A/D conversion time
(1)
(2)
Figure 15.5 A/D Conversion Timing
t
D
t
SPL
t
CONV
Rev. 3.00 Sep 15, 2006 page 655 of 988
D
and the input sampling time. The
Section 15 A/D Converter
REJ09B0330-0300