ATAM862 datasheet(85/110 Pages) ATMEL

85 / 110 page

4554E–4BMCU–05/06

ATAM862-3

24.1.3

Combination Mode 3: Manchester Modulation 1

SSI mode 1:

8-bit shift register internal data output (SO) to the Timer 2

modulator stage

Timer 2 mode 1, 2, 3 or 4:

8-bit compare counter with 4-bit programmable prescaler

Timer 2 output mode 5:

The modulator 2 of Timer 2 modulates the SSI internal

data output to Manchester code

Figure 24-4. Manchester Modulation 1

24.1.4

Combination Mode 4: Manchester Modulation 2

SSI mode 1:

8-bit shift register internal data output (SO) to the Timer 2

modulator stage

Timer 2 mode 3:

8-bit compare counter and 4-bit prescaler

Timer 2 output mode 5:

The modulator 2 of Timer 2 modulates the SSI data output

to Manchester code

The 4-bit stage can be used as prescaler for the SSI to generate the stop signal for modulator 2.

The SSI has a special mode to supply the prescaler with the shift clock. The control output signal

(OMSK) of the SSI is used as stop signal for the modulator. Figure 24-5 shows an example for a

12-bit Manchester telegram.

Figure 24-5. Manchester Modulation 2

TOG2

T2O

8-bit SR-data

Bit 7

Bit 0

Bit 7

Bit 0

Data: 00110101

012

Counter 2/1 = Compare Register 2/1 (= 4)

Bit 7 Bit 6

Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

SCLI

Buffer full

SIR

MSM

Timer 2

Mode 3

SCL

Counter 2/1

OMSK

T2O

ATAM862 Datasheet(PDF) 85 Page - ATMEL Corporation

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