Freescale-semiconductor ColdFire MCF52210 Manual do Utilizador descarregar pdf (Página 460)

100

101

Analog-to-Digital Converter (ADC)

MCF52211 ColdFire® Integrated Microcontroller Reference Manual, Rev. 2

26-24 Freescale Semiconductor

Figure 26-20. Input Select Mux

Parallel, Single Ended The two 1-of-4 select muxes can be

set for the appropriate input line.

The lower switch selects V

REFL

for the

V- input of the A/D. The upper switch is

always closed so that any of the four

inputs can get to the V+ A/D input.

Parallel, Differential The channel select switches are

turned on in pairs, providing a dual

1-of-2 select function, such that either

of the two differential channels can be

routed to the A/D input.

The upper and lower switches are

open and the middle switch is closed,

providing the differential channel to

the differential input of the A/D.

Table 26-20. Analog MUX Controls for Each Conversion Mode (continued)

Conversion Mode Channel Select Switches Single Ended Differential Switches

AN3

AN2

AN1

AN0

REFL

V+

V–

Channel

Select

Converter A

Single-Ended

Interface

Function

MUX Configuration for Differentialvs

Channel Select

Single-Ended vs

Differential

AN7

AN6

AN5

AN4

REFL

V+

V–

Channel

Select

Converter B

Single-Ended

Interface

Function

AN3

AN2

AN1

AN0

REFL

V+

V–

Channel

Select

Converter A

Differential

Interface

Function

AN7

AN6

AN5

AN4

REFL

V+

V–

Channel

Select

Converter B

Differential

Interface

Function

Channel Select

Single-Ended vs

Differential

Channel Select

Single-Ended vs

Differential

Channel Select

Single-Ended vs

Differential

MUX Configuration for Single-Ended

1 2 ... 455 456 457 458 459 460 461 462 463 464 465 ... 575 576

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