ST2202 datasheet(37/65 Pages) ETC

Part #	ST2202

Description	8 BIT Integrated Microcontroller with 256K Bytes ROM

PDF	65 Pages

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Manufacturer	ETC [List of Unclassifed Manufacturers]

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37 / 65 page

Sitronix

ST2202

Ver 2.0a

37/65

2003-May-05

15.2 PWM DAC Mode Options

The PWM DAC generator has three modes, Single-pin

mode, Two-pin two-ended mode and Two-pin push pull

mode. They are depended on the application used. The

DAC mode is controlled by DMD[1~0]. (TABLE 13-3)

15.2.1 Single-Pin Mode (7-bit Accuracy)

Single-pin mode is designed for use with a single-transistor

amplifier. It has 7 bits of resolution. The duty cycle of the

PSG1 is proportional to the output value. If the output value

is 0, the duty cycle is 50%. As the output value increases

from 0 to 63, the duty cycle goes from being high 50% of

the time up to 100% high. As the value goes from 0 to -64,

the duty cycle decreases from 50% high to 0%. PSG0 is

inverse of PSG1’s waveform. Figure 13-3 shows the PSG1

waveforms.

DAC = 0

DAC = 32

DAC = -32

DAC = X

64+X

64-X

High

Low

PSG1

FIGURE 15-3 Single-Pin Mode Wave Form

ST2202 Datasheet(PDF) 37 Page - List of Unclassifed Manufacturers