411
Table 14.4
A/D Conversion Time (Single Mode)
CKS = 0
CKS = 1
Symbol
Min
Typ
Max
Min
Typ
Max
Synchronization delay
t
D
6
—
9
4
—
5
Input sampling time
t
SPL
—
31
—
—
15
—
A/D conversion time
t
CONV
131
—
134
69
—
70
Note:
Values in the table are numbers of states.
14.4.4
External Trigger Input Timing
A/D conversion can be externally triggered When the TRGE bit is set to 1 in ADCR and the 8-bit
timer's ADTE bit is cleared to 0, external trigger input is enabled at the
ADTRG
pin. A high-to-
low transition at the
ADTRG
pin sets the ADST bit to 1 in ADCSR, starting A/D conversion.
Other operations, in both single and scan modes, are the same as if the ADST bit had been set to 1
by software. Figure 14.6 shows the timing.
φ
ADTRG
Internal trigger
signal
ADST
A/D conversion
Figure 14.6 External Trigger Input Timing
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