603
Table 16-4 A/D Conversion Time (Single Mode)
CKS1 = 0
CKS1 = 0
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 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
55
—
530 259 —
266 131 —
134 67
—
68
Note:
Values in the table are the number of states.
Table 16-5 A/D Conversion Time (Scan Mode)
CKS1
CKS0
Conversion Time (State)
0
0
512 (Fixed)
1
256 (Fixed)
1
0
128 (Fixed)
1
64 (Fixed)
16.4.4
External Trigger Input Timing
A/D conversion can be externally triggered. When the TRGS1 and TRGS0 bits are set to 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 if the ADST bit has been set to 1 by software. Figure 16-6 shows the
timing.
ø
ADTRG
Internal trigger signal
ADST
A/D conversion
Figure 16-6 External Trigger Input Timing
Summary of Contents for H8S/2645
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