HD64336901G Renesas Technology, HD64336901G Datasheet - Page 290

• Manufacturer Part Number: HD64336901G
• Description: (HD64xxx Series) 16-BIT MICROCONTROLLER
• Manufacturer: Renesas Technology

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
starts conversion. Figure 16.2 shows the A/D conversion timing. Table 16.3 shows the A/D
conversion time.
As indicated in figure 16.2, the A/D conversion time includes t
length of t
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 128 states (fixed) when CKS = 0 and 66 states
(fixed) when CKS = 1.
Rev. 1.00, 11/03, page 262 of 376
Input Sampling and A/D Conversion Time
D
varies depending on the timing of the write access to ADCSR. The total conversion
Address
Write signal
Input sampling
timing
ADF
[Legend]
(1):
(2):
t
t
t
D
SPL
CONV
:
:
: A/D conversion time
ADCSR write cycle
ADCSR address
A/D conversion start delay
Figure 16.2 A/D Conversion Timing
Input sampling time
(1)
(2)
t
D
t
SPL
D
) has passed after the ADST bit is set to 1, then
t
CONV
D
and the input sampling time. The