ATAM894 datasheet(82/97 Pages) ATMEL

82 / 97 page

4679D–4BMCU–05/05

ATAM894

Combination Mode 12: Burst Modulation 2

SSI mode 1:

8-bit shift register internal data output (SO) to the Timer 3

Timer 2 output mode 2:

8-bit compare counter and 4-bit prescaler

Timer 2 output mode 1/6:

Timer 2 compare match toggles (TOG2) to the SSI

Timer 3 mode 7:

Carrier frequency burst modulation controlled by the internal

output (SO) of SSI

The Timer 3 counter is driven by an internal or external clock source. Its compare- and compare

mode registers must be programmed to generate the carrier frequency with the output toggle

flip-flop (M3). The internal data output (SO) of the SSI is used to enable and disable the Timer 3

output. The SSI can be supplied with the toggle signal of Timer 2.

Figure 6-64.

Burst Modulation 2

Combination Mode 13: FSK Modulation

SSI mode 1:

8-bit shift register internal data output (SO) to the Timer 3

Timer 2 output mode 3:

8-bit compare counter and 4-bit prescaler

Timer 2 output mode 1/6:

Timer 2 4-bit compare match signal (POUT) to the SSI

Timer 3 mode 8:

FSK modulation with shift register data output (SO)

The two compare registers are used to generate two different time intervals. The SSI data output

selects which compare register is used for the output frequency generation. A '0' level at the SSI

data output enables the compare register 1 and a '1' level enables the compare register 2. The

compare- and compare mode registers must be programmed to generate the two frequencies

via the output toggle flip-flop. The SSI can be supplied with the toggle signal of Timer 2 or any

other clock source. The Timer 3 counter is driven by an internal or external clock source.

0 1 01 2 3 4 5 01 0 1 2 3 4 5 0 1 0 1 23 4 5 0 1 01

5 0 1 0 1

5 0 1 01

5 0 1 0 1

5 0 1 01

5 0 1 0 1

CL3

Counter 3

CM31

CM32

TOG3

Counter 2/2

TOG2

T3O

ATAM894 Datasheet(PDF) 82 Page - ATMEL Corporation

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