Datasheet

267
2490R–AVR–02/2013
ATmega64(L)
GNDEN Input Ground the negative
input to comparator
when true
00
HOLD Input Sample&Hold
signal. Sample
analog signal when
low. Hold signal
when high. If gain
stages are used,
this signal must go
active when ACLK
is high.
11
IREFEN Input Enables Band-gap
reference as AREF
signal to DAC
00
MUXEN_7 Input Input Mux bit 7 0 0
MUXEN_6 Input Input Mux bit 6 0 0
MUXEN_5 Input Input Mux bit 5 0 0
MUXEN_4 Input Input Mux bit 4 0 0
MUXEN_3 Input Input Mux bit 3 0 0
MUXEN_2 Input Input Mux bit 2 0 0
MUXEN_1 Input Input Mux bit 1 0 0
MUXEN_0 Input Input Mux bit 0 1 1
NEGSEL_2 Input Input Mux for
negative input for
differential signal,
bit 2
00
NEGSEL_1 Input Input Mux for
negative input for
differential signal,
bit 1
00
NEGSEL_0 Input Input Mux for
negative input for
differential signal,
bit 0
00
PASSEN Input Enable pass-gate of
gain stages.
11
PRECH Input Precharge output
latch of comparator
(Active low)
11
Table 104. Boundary-scan Signals for the ADC
(1)
(Continued)
Signal
Name
Direction
as Seen
from the
ADC Description
Recommended
Input when not
in Use
Output Values when
Recommended Inputs
are Used, and CPU is
not Using the ADC