T48C893 datasheet(46/82 Pages) ATMEL

46 / 82 page

T48C893

Rev. A4, 22-Jan-02

46 (82)

Timer 3 – Mode 7: Carrier Frequency Burst Modulation Controlled by SSI Internal Output (SO)

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 via the output toggle flip-flop. The output (SO) of the SSI is used

to enable or disable the Timer 3 output. The SSI should be supplied with the toggle signal of Timer 2 (see combination

mode 12).

Timer 3 – Mode 8: FSK Modulation with Shift Register Data (SO)

The two compare registers are used for generating two different time intervals. The SSI internal data output (SO) selects

which compare register is used for the output frequency generation. A ’0’ level at the SSI data output enables the

compare register 1. An ’1’ level enables compare register 2. The both 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. The Timer 3 counter is driven by an internal or external clock source. The Timer 2 counter is driven

by the Counter 3 (TOG3) (see also combination mode 13).

01234012340123

Counter 3

CM31

CM32

13815

401201201201201201201 20123

T3R

T3O

Figure 51. FSK modulation

Timer 3 – Mode 9: Pulse-Width Modulation with the Shift Register

The two compare registers are used for generating two different time intervals. The SSI internal data output (SO) selects

which compare register is used for the output pulse generation. In this mode both compare- and compare mode registers

must be programmed for generating the two pulse widths. It is also useful to enable the single-action mode for extreme

duty cycles. Timer 2 is used as baudrate generator and for the trigger restart of Timer 3. The SSI must be supplied with

a toggle signal of Timer 2. The counter is driven by an internal or external clock source (see combination mode 7).

0000 00000

000 0

Counter 3

CM31

CM32

T3O

13816

000001 2345 6789 1011121314150 12345

TOG2

67 8

91112

2 3

SIR

SCO

T3R

Figure 52. Pulse-width modulation

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