Atmel ATmega128 User Manual

263
2467S–AVR–07/09
ATmega128
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 (Continued)
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

Atmel ATmega128 Specifications

General

Brand	Atmel
Model	ATmega128
Category	Microcontrollers
Language	English