Rainbow-electronics ATAR862-8 User Manual download pdf (Page 88)

ATAR862-8

4589B–4BMCU–02/03

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 91. 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 pro-

grammed 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.

0101234501012345010123450101 50101 50101 50101 50101 50101 50101 50101 50101 50101

30 1 2 3 3 0 1 32

CL3

Counter 3

CM31

CM32

TOG3

Counter 2/2

TOG2

T3O

1 2 ... 83 84 85 86 87 88 89 90 91 92 93 ... 105 106

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Rainbow-electronics ATAR862-8 User Manual Page 88