ATAR080 datasheet(39/68 Pages) ATMEL

39 / 68 page

ATAR080

4675D–4BMCU–12/04

Timer 2 Mode Register 2 (T2M2)

Note:

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

activated.

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 cur-

rent 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

compare 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 18. Timer 2 Output Select Bits

Output

Mode

T2OS2

T2MS1

T2MS0

Clock Output

Toggle mode: a Timer 2 compare match

toggles the output flip-flop (M2)

→T2O

Duty cycle burst generator 1: the DCG output

signal (DCG0) is given to the output and

gated by the output flip-flop (M2)

Duty cycle burst generator 2: the DCG output

signal (DCGO) is given to the output and

gated by the SSI internal data output (SO)

Bi-phase modulator: Timer 2 modulates the

SSI internal data output (SO) to

Bi-phase code

Manchester modulator: Timer 2 modulates

the SSI internal data output (SO) to

Manchester code

SSI output: T2O is used directly as SSI

internal data output (SO)

PWM mode: an 8/12-bit PWM mode

Not allowed

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