AS3665 datasheet(53/78 Pages) AMSCO

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AS3665

Datasheet, Confidential - Prog ramming S equen ce r C o mmands

Ramping of PWM(s) dependent on variables is achieved by the Ramp with variable command shown in Table 74. This

command also can be used to wait for a defined time in the program execution (if number of increments = 0).

Table 74. Ramp with variable Command

Ramp with variable 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 with

variable

Compiler syntax: RWV, prescale, sign, variable for step, variable for number of increments;

D15:D6

10000100_

00b

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

sign

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

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

D3:D2

variable for

step

The content of the variable defines the duration between single

increments/decrements; e.g. if variable rx=8, prescale=0, sign=0, the

duration between every increment is typically 0.49ms*8 = 3.92ms

variable ra

variable rb

variable rc

variable rd

D1:D0

variable for

number of

increments

If the content of the variable rx is

0 then wait for duration defined by prescale and D3:D2

1-255 then it defines the number of actual cycles in a single ramp

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

variable ra

variable rb

variable rc

variable rd

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