MAC7200 datasheet(788/976 Pages) FREESCALE

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Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

710

Freescale Semiconductor

MODE[0] bit selects which type of encoder will be used: count & direction encoder or phase_A &

phase_B encoders.

When operating with count & direction encoder (MODE[0] cleared), UCn input pin must be connected to

the direction signal and UC[n-1] input pin must be connected to the count signal of the quadrature encoder.

UCn EDPOL bit selects count direction according to direction signal and UC[n-1] EDPOL bit selects if

the internal counter is clocked by the rising or falling edge of the count signal.

When operating with phase_A & phase_B encoder (MODE[0] set), UCn input pin must be connected to

the phase_A signal and UC[n-1] input pin must be connected to the phase_B signal of the quadrature

encoder. EDPOL bit selects the count direction according to the phase difference between phase_A &

phase_B signals.

Figure 32-27 and Figure 32-28 show two Unified Channels configured to quadrature decode mode for

count & direction encoder and phase_A & phase_B encoders, respectively.

Figure 32-27. Quadrature Decode mode example with count & direction encoder

Figure 32-28. Quadrature Decode mode example with phase_a & phase_B encoder

Notes:

1. UCAn => A1

+1 +1 +1 +1 +1 +1 +1

-1 -1 -1 -1 -1

UCCNTn inc/dec

direction (from UCn)

count (from UC[n-1])

$000000

UCCNTn

Time

A1 write

A1 Match

FLAG set event

A1 Match

value 1

(value 1)

MODE[0]

= 0

EDPOL = 1

Notes:

1. UCAn = A1

+1 +1 +1 +1 +1 +1 +1 +1

-1 -1 -1 -1 -1

+1 +1 +1 +1 +1 +1

-1

UCCNTn inc/dec

phase A (from UCn)

phase B (from UC[n-1])

$000000

UCCNTn

Time

A1 write

A1 Match

FLAG set event

A1 Match

A1 write

value 2

value 1

(value 1)

(value 2)

MODE[0]= 1

-1

-1 -1 -1 -1 -1

+1 +1 +1 +1 +1 +1

-1

MAC7200 Datasheet(PDF) 788 Page - Freescale Semiconductor, Inc

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