HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 450

• Manufacturer Part Number: HD6417034B
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 14 A/D Converter
14.4.3
With a built-in sample-and-hold circuit, the A/D converter performs input sampling at time t
after control/status register (ADSCR) access is started. See figure 14.5 for A/D conversion timing
and table 14.4 for A/D conversion times.
The total conversion time includes t
purpose of t
the duration of t
in table 14.4.
In scan mode, the ranges given in table 14.4 apply to the first conversion. The duration of the
second and subsequent conversion processes is fixed at 256 states (CKS = 0) or 128 states (CKS =
1).
Rev. 7.00 Jan 31, 2006 page 424 of 658
REJ09B0272-0700
Input Sampling Time and A/D Conversion Time
D
Input sampling
t
t
t
Notes: 1. ADSCR write cycle
is to synchronize the ADCSR write time with the A/D conversion process; therefore
D
SPL
CONV
D
A/D start delay
is variable. As a result, the total conversion time varies within the ranges shown
Input sampling time
Address
A/D conversion time
2. ADSCR address
timing
signal
Write
ADF
CK
Figure 14.5 A/D Conversion Timing
*1
*2
t
D
D
and the input sampling time, as shown in figure 14.5. The
t
SPL
t
CONV
D