DMC73C167 datasheet(63/90 Pages) DAEWOO

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8Bit Single Chip Microcontroller

DMC73C167

5.8 6-bit PWM (PWM1_0-PWM1_8)

5.8.1 Description of PWM1

The DMC73C167 microcontrollers feature nine PWM output ports.

Each port contains 6-bit resolution.

The ports are provided for the application of analog circuit control when combined

with an external low pass filter circuit. As shown in Figure 5-14, the 6-bit PWM is

composed of a 6-bit timer, two 6-bit latches, and two 6-bit comparators. When

started the 6-bit timer is filled up with 3Fh and increments during every period of

Fosc/16. The 6-bit timer is used for all 6-bit PWMs in common. For any of the nine

PWMs to start, the 6-bit timer must already be started. If the value of the 6-bit timer

is greater than a value of the latched 6-bit data, the comparator output is logic high

status.

Each PWM output port contains its own polarity control bit, which enables the port to

be selected as inverted or non-inverted output. If the PWM function is not required,

the port to be selected as inverted or non-inverted output. If the PWM function is not

required, the port could easily be used as a normal digital output port through polarity

control.

Notes:

PWM1_0-PWM1_8 ports are +12 V open-drain output.

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DMC73C167 Datasheet(PDF) 63 Page - Daewoo Semiconductor