Rainbow-electronics ATmega32L Uživatelský manuál stáhnout pdf (Strana 234)

234

ATmega32(L)

2503C–AVR–10/02

Note: Incorrect setting of the switches in Figure 123 will make signal contention and may damage the part. There are several input

choices to the S&H circuitry on the negative input of the output comparator in Figure 123. Make sure only one path is selected

from either one ADC pin, Bandgap reference source, or Ground.

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. 1 1

PRECH Input Precharge output latch of

comparator. (Active low)

SCTEST Input Switch-cap TEST enable. Output

from x10 gain stage send out to

Port Pin having ADC_4

ST Input Output of gain stages 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 92. Boundary-scan Signals for the ADC (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

1 2 ... 229 230 231 232 233 234 235 236 237 238 239 ... 312 313

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Rainbow-electronics ATmega32L Uživatelský manuál Strana 234