ST92196A STMicroelectronics, ST92196A Datasheet - Page 214
ST92196A
Manufacturer Part Number
ST92196A
Description
8/16-bit Mcu For Tv Applications With Up To 96k Rom, On-screen-display And 1 Or 2 Data Slicers
Manufacturer
STMicroelectronics
Datasheet
1.ST92196A.pdf
(268 pages)
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8.13 PWM GENERATOR
8.13.1 Introduction
The PWM (Pulse Width Modulated) signal genera-
tor allows the digital generation of up to 8 analog
outputs when used with an external filtering net-
work.
The unit is based around an 8-bit counter which is
driven by a programmable 4-bit prescaler, with an
input clock signal equal to the internal clock
INTCLK divided by 2. For example, with a 12 MHz
Internal clock, using the full 8-bit resolution, a fre-
Figure 95. PWM Block Diagram.
Compare 6
Compare 7
Compare 5
Compare 4
Compare 3
Compare 0
Compare 1
Autoclear
Compare 2
8 Bit Counter
Control Logic
quency range from 1465 Hz up to 23437 Hz can
be achieved.
Higher frequencies, with lower resolution, can be
achieved by using the autoclear register. As an ex-
ample, with a 12 MHz Internal clock, a maximum
PWM repetition rate of 93750 Hz can be reached
with 6-bit resolution.
Note: The number of output pins is device de-
pendant. Refer to the device pinout description.
4 Bit Presc.
INTCLK/2
- PWM GENERATOR
PWM0
PWM7
VR01765
214/268
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