Filter
Top Products
Rev. 1.00, 05/04, page 422 of 544
Table 16.3 A/D Conversion Time (Single Mode)
CKS = 0 CKS = 1
Item Symbol Min. Typ. Max. Min. Typ. Max.
A/D conversion start delay
time
t
D
10 — 17 6 — 9
Input sampling time t
SPL
— 63 — — 31 —
A/D conversion time t
CONV
259 — 266 131 — 134
Note: * Values in the table indicate the number of states.
16.4.4 External Trigger Input Timing
A/D conversion can be externally triggered. When the TRGS1 and TRGS0 bits are set to B'11 in
ADCR, external trigger input is enabled at the ADTRG pin. A falling edge 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 when the ADST bit has been set to 1 by software. Figure 16.4 shows the
timing.
A/D conversion
φ
ADTRG
Internal trigger
signal
ADST
Figure 16.4 External Trigger Input Timing