312
7679H–CAN–08/08
AT90CAN32/64/128
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 23-7. 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
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