Rainbow-electronics ATmega128L Uživatelský manuál stáhnout pdf (Strana 255)

255

ATmega128(L)

2467B–09/01

G10 Input Enable 10x gain 0 0

G20 Input Enable 20x gain 0 0

GNDEN Input Ground the negative

input to comparator

when true

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.

IREFEN Input Enables Band-Gap

reference as AREF

signal to DAC

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

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

gain stages.

PRECH Input Precharge output latch

of comparator. (Active

low)

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

1 2 ... 250 251 252 253 254 255 256 257 258 259 260 ... 330 331

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