AS3665 datasheet(52/78 Pages) AMSCO

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AS3665

Datasheet, Confidential - Prog ramming Audio Pr ocessin g

Audio Processing

Use austriamicrosystems sample codes for audio processing.

Sequencer Commands

Ramping of PWM(s) is achieved by the Ramp/Wait command shown in Table 72. The selected channels are chosen

by MUX tables - assignments of sequencers to channels on page 49. This command also can be used to wait for a

defined time in the program execution (if number of increments = 0).

With the Set PWM command PWM(s) (PWM channels are connected to a sequencer as shown in section MUX tables

- assignments of sequencers to channels on page 49) can be immediately forced to a value:

Table 72. Ramp/Wait Command

Ramp/Wait Command

Ramps the PWM of the selected PWM generator up or down;

if the number of increments is zero, it simply waits

Name

Bits

Bitname

Parameter Description

Ramp/Wait

Compiler syntax: RMP, prescale, step time, sign, number of increments;

D15

D14

prescale

each step has 16 clock cycles (typ. 0.49ms at 32768Hz)

each step has 512 clock cycles (typ. 15.6ms at 32768Hz)

the clock generation is described in section Clock Generation on page 14

D13:D9

step time

1-31

duration between single increments/decrements

e.g. if step time=8, prescale=0, sign=0, the duration between

every increment is typically 0.49ms*8 = 3.92ms

sign

ramp up, always increment by 1; 255 is maximum value

ramp down, always decrement by 1; 0 is minimum value

D7:D0

number of

increments

Wait for duration defined by prescale and step time

1-255

number of actual cycles in a single ramp command

(e.g. 255 defines a full scale ramp)

Table 73. Set PWM Command

Set PWM Command

Force PWM

Name

Bits

Bitname

Parameter Description

Set PWM

Compiler syntax: SPW, pwm value;

D15:D8

01000000b

(40h)

D7:D0

pwm value

0-255

actual PWM value used:

0...off

255...full scale

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