h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 455

• Manufacturer Part Number: h8s-2111b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

16.4.3
The A/D converter has a built-in sample-and-hold circuit. The A/D converter samples the analog
input when the A/D conversion start delay time (t
1, then starts A/D conversion. Figure 16.3 shows the A/D conversion timing. Table 16.3 indicates
the A/D conversion time.
As indicated in figure 16.3, the A/D conversion time (t
(t
conversion time therefore varies within the ranges indicated in table 16.3.
In scan mode, the values given in table 16.3 apply to the first conversion time. In the second and
subsequent conversions, the conversion time is 256 state (fixed) when CKS = 0 and 128 states
(fixed) when CKS = 1.
SPL
). The length of t
Input Sampling and A/D Conversion Time
Address
Write signal
Input sampling
timing
ADF
φ
[Legend]
(1):
(2):
t
t
t
D
SPL
CONV
:
:
: A/D conversion time
ADCSR write cycle
ADCSR address
A/D conversion start delay
Input sampling time
D
varies depending on the timing of the write access to ADCSR. The total
(1)
(2)
t
D
Figure 16.3 A/D Conversion Timing
t
SPL
D
t
) passes after the ADST bit in ADCSR is set to
CONV
CONV
) includes t
Rev. 1.00, 05/04, page 421 of 544
D
and the input sampling time