MAC7200 datasheet(787/976 Pages) FREESCALE

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Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

709

Figure 32-25 and Figure 32-26 show how the Unified Channel can be used for continuos or single shot

pulse/edge counting mode.

Figure 32-25. Pulse/Edge Counting continuous mode example

Figure 32-26. Pulse/Edge Counting single-shot mode example

32.13.1.1.9

Quadrature Decode (QDEC) Mode

Quadrature decode mode uses UCn operating in QDEC mode and the input programmable filter (IPF)

from UC[n-1]. Note that UC[n-1] can be configured, at the same time, to an operation mode that does not

use I/O pins, such as MC mode (modulus counter). The connection among the UCs is circular, i.e., when

UC[0] is running in QDEC mode, the input programmable filter from UC[23] is being used.

This mode generates a FLAG every time the internal counter matches A1 register. The internal counter is

automatically selected and is not cleared when entering this mode.

amount of events detected

$000000

UCCNTn

Time

B1 Match

Flag set event

A1 B1 write

selected counter bus

$000303

$000090

$000303

$000090

A1 value1

$000090

B1 Match

A1 match

amount of events detected

B1 value2

$000303

A1 Match

$000090

Notes: 1. UCAn = A1

2. UCBn = B1

MODE[0]= 0

A2 value3

UCCNTn

3 ALTAn = A2

amount of events detected

$000000

UCCNTn

Time

B1 Match

Flag set event

A1 B1 write

selected counter bus

$000303

$000090

$000303

$000090

A1 value1

$000090

B1 Match

A1 match

amount of events detected

B1 value2

$000303

A1 Match

$000090

Notes: 1. UCAn = A1

2. UCBn = B1

MODE[0]= 1

A2 value3

UCCNTn

3 ALTAn = A2

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