Remote-processing RPC-2300 Manual de usuario descargar pdf (Pagina 31)

CHAPTER 10 SPEAKER

RPC-2300 Page 29

Figure 10-1 Jumper W7

Figure 10 -2 Interfa ce schem atic

DESCRIPTION

Pin 16 on the card edge connector is the speaker output

from the 64180 C PU chip. This port can be used to

drive a speaker. The SO UN D com mand is use d to

generate a frequency.

Sound output is not available when a 512K R AM is

installed. This is due to the fact one of the address lines

is also used as a fr equency output.

SOUN D Syntax is:

SOUND frequency

SOUND frequency,duration

frequency is from about 20 Hz to over 20,000 Hz.

duration is from 0. 01 to 325 seconds.

NOTE: When SOUND is used with a duration

parameter, program execution is suspended

until it is timed out.

Speaker output is controlled by jumper W7.

[1-2],[3-4] 512K RAM installed

[1-3],[2-4] Speaker enabled

Connecting a speaker

Refer to figure 10-2 below for circuit connections to a

speaker. T he series resistor determines the volume. the

Capacitor sets the lower frequency limit. Generally,

values from 100 uF to 470 uF ar e adequate. The

speaker may be any value but those with 50 ohms or

greater produce higher sound output.

WARNING:

Do not connect pin 16 directly to a speaker, ground,

or + 5V, even momentarily, as damage to the CPU

will result.

Program ming ex ample

The following example produces tones from 200 to 5000

hz and back down again in 500 hz increm ents.

10 FOR N = 200 TO 5000 STEP 500

20 SOUND N,.5

30 NEXT

40 FOR N = 5000 TO 200 STEP -500

50 SOUND N,.5

60 NEXT

70 GOTO 10

To stop program execution, press the < esc> key.

AIN and AOT commands shut off the sound.

1 2 ... 26 27 28 29 30 31 32 33 34 35 36

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Remote-processing RPC-2300 Manual de usuario Pagina 31

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