MAC7200 datasheet(790/976 Pages) FREESCALE

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Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

712

Freescale Semiconductor

The internal counter counts up from the current value until it matches the value in register A1. Register B1

is cleared and is not acessible to the MCU. MODE[2] bit selects up mode or up/down mode, when cleared

or set, respectivelly.

When in up count mode, a match between the internal counter and register A1 sets the FLAG and clears

the internal counter.

When in up/down count mode, a match between the internal counter and register A1 sets the FLAG and

changes the counter direction from increment to decrement. A match between register B1 and the internal

counter changes the counter direction from decrement to increment and sets the FLAG only if MODE[1]

bit is set.

Figure 32-30 and Figure 32-31 show how the Unified Channel can be used as modulus counter in up mode

and up/down mode, respectively.

Figure 32-30. Modulus Counter up mode example

Figure 32-31. Modulus Counter up/down mode example

32.13.1.1.12 Modulus Counter Buffered (MCB) Mode

The MCB mode provides a time base which can be shared with other channels through the internal counter

buses. Register A1 is double buffered thus allowing smooth transitions between cycles when changing A2

$FFFFFF

$000303

$000000

UCCNTn

Time

Match A1

A1 value1

$000303

$000200

write to A2

Match A1

write to A2

$000200

Match A1

$xxxxxx

FLAG set event

Notes: 1. UCAn = A1

$000303

$000200

A2 = A1according to OUn bit

MODE[2]= 0

$FFFFFF

$000303

$000000

UCCNTn

Time

Match A1

A1 value1

$000303

$000200

write to A2

Match B1(=0)

write to A2

$000200

Match A1

Match B1(=0)

$xxxxxx

Notes: 1. UCAn = A1

$000200

FLAG set event

A2 = A1according to OUn bit

MODE[2]= 1

MAC7200 Datasheet(PDF) 790 Page - Freescale Semiconductor, Inc

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