Datasheet

269
8018P–AVR–08/10
ATmega169P
Table 25-3. Boundary-scan Signals for the ADC
(1)
Signal
Name
Direction
as Seen
from the
ADC Description
Recommen-
ded Input
when not in
use
Output Values when
Recommended Inputs
are Used, and CPU is
not Using the ADC
COMP Output Comparator Output 0 0
ACLK Input
Clock signal to
differential amplifier
implemented as Switch-
cap filters
00
ACTEN Input
Enable path from
differential amplifier to
the comparator
00
ADCBGEN Input
Enable Band-gap
reference as negative
input to comparator
00
ADCEN Input
Power-on signal to the
ADC
00
AMPEN Input
Power-on signal to the
differential amplifier
00
DAC_9 Input
Bit 9 of digital value to
DAC
11
DAC_8 Input
Bit 8 of digital value to
DAC
00
DAC_7 Input
Bit 7 of digital value to
DAC
00
DAC_6 Input
Bit 6 of digital value to
DAC
00
DAC_5 Input
Bit 5 of digital value to
DAC
00
DAC_4 Input
Bit 4 of digital value to
DAC
00
DAC_3 Input
Bit 3 of digital value to
DAC
00
DAC_2 Input
Bit 2 of digital value to
DAC
00
DAC_1 Input
Bit 1 of digital value to
DAC
00
DAC_0 Input
Bit 0 of digital value to
DAC
00
EXTCH Input
Connect ADC channels 0
- 3 to by-pass path
around differential
amplifier
11
GNDEN Input
Ground the negative
input to comparator when
true
00