315
Bit 7: Clock select (CKS)
Bit 7 sets the A/D conversion speed.
Bit 7
Conversion Time
CKS
Conversion Period
ø = 1 MHz
ø = 5 MHz
0
62/ø (initial value)
62
µ
s
12.4
µ
s
1
31/ø
31
µ
s
—
Note:
*
Operation is not guaranteed if the conversion time is less than 12.4
µ
s. Set bit 7 for a value
of at least 12.4
µ
s.
Bit 6: External trigger select (TRGE)
Bit 6 enables or disables the start of A/D conversion by external trigger input.
Bit 6
TRGE
Description
0
Disables start of A/D conversion by external trigger
(initial value)
1
Enables start of A/D conversion by rising or falling edge of external trigger at pin
ADTRG
*
Note:
*
The external trigger (
ADTRG
) edge is selected by bit INTEG4 of IEGR. See 1. Interrupt
edge select register (IEGR) in 3.3.2 for details.
Bits 5 and 4: Reserved bits
Bits 5 and 4 are reserved; they are always read as 1, and cannot be modified.