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Section 15 A/D Converter
Rev. 3.00 Mar. 14, 2006 Page 560 of 804
REJ09B0104-0300
Table 15.3 A/D Conversion Characteristics (Single Mode)
CKS1 = 0
CKS1 = 1
CKS0 = 0
CKS0 = 1
CKS0 = 0
CKS0 = 1
Item Symbol
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
A/D conversion
start delay time
t
D
18
33
10
17
6
9
4
5
Input sampling time t
SPL
127
63
31
15
A/D conversion
time
t
CONV
515
530
259
266
131
134
67
68
Note: Values in the table are the number of states.
Table 15.4 A/D Conversion Characteristics (Scan Mode)
CKS1
CKS0
Conversion Time (Number of States)
0 512
(Fixed)
0
1 256
(Fixed)
0 128
(Fixed)
1
1 64
(Fixed)
15.4.4 External
Trigger Input Timing
A/D conversion can be externally triggered. When the TRGS1 and TRGS0 bits are set to B'11 in
ADCR, an external trigger is input from the
ADTRG
pin. A/D conversion starts when the ADST
bit in ADCSR is set to 1 on the falling edge of the
ADTRG
pin. Other operations, in both single
and scan modes, are the same as when the ADST bit has been set to 1 by software. Figure 15.6
shows the timing.
P
φ
ADTRG
Internal trigger signal
ADST
A/D conversion
Figure 15.6 External Trigger Input Timing
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