Datasheet

Section 17 A/D Converter
Rev. 2.00 Sep. 23, 2005 Page 325 of 444
REJ09B0068-0200
Table 17.3 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
6 — 9 4 — 5
Input sampling time t
SPL
— 31 — — 15 —
A/D conversion time t
CONV
131 — 134 69 — 70
Note: All values represent the number of states.
17.4.4 External Trigger Input Timing
A/D conversion can also be started by an external trigger input. When the TRGE bit in ADCR is
set to 1, external trigger input is enabled at the ADTRG pin. A falling edge at the ADTRG input
pin sets the ADST bit in ADCSR to 1, 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 17.3
shows the timing.
φ
ADTRG
Internal trigger signal
ADST
A/D conversion
Figure 17.3 External Trigger Input Timing