T48C893 datasheet(35/82 Pages) ATMEL

35 / 82 page

T48C893

Rev. A4, 22-Jan-02

35 (82)

output is connected to T2O and switched on and off either

by the toggle flipflop output or the serial data line of the

SSI. Modulator 2 also has 2 modes to output the content

of the serial interface as Biphase or Manchester code.

The modulator output stage can be configured by the

output control bits in the T2M2 register. The modulator

is started with the start of the shift register (SIR = 0) and

stopped either by carrying out a shift register stop

(SIR = 1) or compare match event of stage 1 (CM1) of

Timer 2. For this task, Timer 2 mode 3 must be used and

the prescaler has to be supplied with the internal shift

clock (SCL).

13780

Toggle

RES/SET

Biphase/

Manchester

modulator

T2TOP

T2OS2, 1, 0

T2M2

T2O

Modulator3

OMSK

SSI

CONTROL

TOG2

DCGO

Figure 34. Timer 2 modulator output stage

Timer 2 Output Signals

Timer 2 output mode 1:

Toggle mode A: a Timer 2 compare match toggles the output flip-flop (M2) –> T2O

000123

0123

Input

Counter 2

T2R

Counter 2

CMx

INT4

T2O

13781

Figure 35. Interrupt timer / square wave generator – the output toggles with each edge compare match event

T48C893 Datasheet(PDF) 35 Page - ATMEL Corporation

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