ATAM894 datasheet(45/97 Pages) ATMEL

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4679D–4BMCU–05/05

ATAM894

6.3.2.9

Timer 2 Mode Register 2 (T2M2)

If one of these output modes is used the T2O alternate function of Port 4 must also be activated.

6.3.2.10

Timer 2 Compare and Compare Mode Registers

Timer 2 has two separate compare registers, T2CO1 for the 4-bit stage and T2CO2 for the 8-bit

stage of Timer 2. The timer compares the contents of the compare register current counter value

and if it matches it generates an output signal. Depending on the timer mode, this signal is used

to generate a timer interrupt, to toggle the output flip-flop as SSI clock or as a clock for the next

counter stage.

In the 12-bit timer mode, T2CO1 contains bits 0 to 3 and T2CO2 bits 4 to 11 of the 12-bit com-

pare value. In all other modes, the two compare registers work independently as a 4- and 8-bit

compare register. When assigned to the compare register a compare event will be suppressed.

Address: '7'hex — Subaddress: '2'hex

Bit 3

Bit 2

Bit 1

Bit 0

T2M2

T2TOP

T2OS2

T2OS1

T2OS0

Reset value: 1111b

T2TOP

Timer 2 Toggle Output Preset

This bit allows the programmer to preset the Timer 2 output T2O.

T2TOP = 0, resets the toggle outputs with the write cycle (M2 = 0)

T2TOP = 1, sets toggle outputs with the write cycle (M2 = 1)

Note: If T2R = 1, no output preset is possible

T2OS2

Timer 2 Output Select bit 2

T2OS1

Timer 2 Output Select bit 1

T2OS0

Timer 2 Output Select bit 0

Table 6-11.

Timer 2 Output Select Bits

Output

Mode

T2OS2

T2OS1

T2OS0

Clock Output

1111

Toggle mode: a Timer 2 compare match toggles

the output flip-flop (M2)

→T2O

2110

Duty cycle burst generator 1: the DCG output

signal (DCG0) is given to the output and gated by

the output flip-flop (M2)

3101

Duty cycle burst generator 2: the DCG output

signal (DCGO) is given to the output and gated

by the SSI internal data output (SO)

4100

Bi-phase modulator: Timer 2 modulates the SSI

internal data output (SO) to

Bi-phase code

5011

Manchester modulator: Timer 2 modulates the

SSI internal data output (SO) to Manchester code

6010

SSI output: T2O is used directly as SSI internal

data output (SO)

7001

PWM mode: an 8/12-bit PWM mode

8000

Not allowed

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