ATmega169P datasheet(269/393 Pages) ATMEL

269 / 393 page

269

8018N–AVR–08/09

ATmega169P

HOLD

Input

Sample & Hold signal.

Sample analog signal

when low. Hold signal

when high. If differential

amplifier is used, this

signal must go active

when ACLK is high.

IREFEN

Input

Enables Band-gap

reference as AREF

signal to DAC

MUXEN_7

Input

Input Mux bit 7

MUXEN_6

Input

Input Mux bit 6

MUXEN_5

Input

Input Mux bit 5

MUXEN_4

Input

Input Mux bit 4

MUXEN_3

Input

Input Mux bit 3

MUXEN_2

Input

Input Mux bit 2

MUXEN_1

Input

Input Mux bit 1

MUXEN_0

Input

Input Mux bit 0

NEGSEL_2

Input

Input Mux for negative

input for differential

signal, bit 2

NEGSEL_1

Input

Input Mux for negative

input for differential

signal, bit 1

NEGSEL_0

Input

Input Mux for negative

input for differential

signal, bit 0

PASSEN

Input

Enable pass-gate of

differential amplifier.

PRECH

Input

Precharge output latch of

comparator. (Active low)

SCTEST

Input

Switch-cap TEST enable.

Output from differential

amplifier is sent out to

Port Pin having ADC_4

Input

Output of differential

amplifier will settle faster

if this signal is high first

two ACLK periods after

AMPEN goes high.

VCCREN

Input

Selects Vcc as the ACC

reference voltage.

Table 25-3.

Boundary-scan Signals for the ADC

(1) (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

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